Por que o comando update exibe o mesmo ppa?

Question

Eu estava instalando o editor de texto Atom no Ubuntu 18.04.1 LTS Bionic Beaver usando o comando: -

sudo apt-get install atom

Parei o processo de instalação e agora sempre que eu executo o comando: -

sudo apt update

O seguinte é o resultado: -

Hit:1 http://ppa.launchpad.net/webupd8team/atom/ubuntu bionic InRelease
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.

Sempre que tento instalar o Atom novamente, recebo a seguinte saída: -

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 atom : Depends: gvfs-bin but it is not installable
E: Unable to correct problems, you have held broken packages.

Agora, sempre que eu tento instalar um pacote do terminal usando:

sudo apt-get install "package-name"

Eu recebo uma saída mostrando: Este pacote não tem candidato de instalação.

Por exemplo, se eu instalar o rpm, a saída será: -

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package rpm is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'rpm' has no installation candidate

[* Editar] Agora, quando eu corro sudo apt update , tudo está bem, mas há uma saída estranha no último: -

E: Some index files failed to download. They have been ignored, or old ones used instead.
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Packages (restricted/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Translations (restricted/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11 (restricted/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11 (restricted/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11-icons (restricted/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target CNF (restricted/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target CNF (restricted/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target DEP-11 (universe/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target CNF (universe/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target Packages (multiverse/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target Packages (multiverse/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target Translations (multiverse/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target Translations (multiverse/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target DEP-11 (multiverse/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target DEP-11 (multiverse/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target DEP-11-icons (multiverse/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target CNF (multiverse/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Packages (restricted/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Translations (restricted/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11 (restricted/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11 (restricted/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11-icons (restricted/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target CNF (restricted/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target CNF (restricted/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target DEP-11 (universe/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target CNF (universe/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target Packages (multiverse/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target Packages (multiverse/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target Translations (multiverse/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target Translations (multiverse/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target DEP-11 (multiverse/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target DEP-11 (multiverse/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target DEP-11-icons (multiverse/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target CNF (multiverse/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (restricted/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (restricted/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (restricted/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (restricted/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11-icons (restricted/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (restricted/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (restricted/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (universe/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (universe/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (multiverse/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (multiverse/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (multiverse/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (multiverse/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (multiverse/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (multiverse/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11-icons (multiverse/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (multiverse/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Packages (restricted/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Translations (restricted/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11 (restricted/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11 (restricted/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11-icons (restricted/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target CNF (restricted/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target CNF (restricted/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target DEP-11 (universe/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target CNF (universe/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target Packages (multiverse/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target Packages (multiverse/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target Translations (multiverse/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target Translations (multiverse/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target DEP-11 (multiverse/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target DEP-11 (multiverse/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target DEP-11-icons (multiverse/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target CNF (multiverse/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50

    

Answer 1

Parece que o arquivo da lista de repositórios principal foi excluído.

O seguinte comando fornecerá o arquivo /etc/apt/sources.list da base original obtido do arquivo de imagem baixado para o Ubuntu 18.04 LTS.

sudo echo -e "# Sources.list obtained directly from the downloaded Ubuntu iso image file\ndeb http://archive.ubuntu.com/ubuntu/ bionic main restricted\ndeb http://security.ubuntu.com/ubuntu/ bionic-security main restricted\ndeb http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted" > /etc/apt/sources.list

Uma vez criado o arquivo de código-fonte principal, você precisará atualizar o apt-cache :

sudo apt-get update

Nesse ponto, você pode receber erros, dependendo se alguns de seus PPAs estão em conflito com o repositório principal. É aconselhável desativar todos os seus PPAs antes de tentar corrigir seus problemas de recompra. No entanto, isso também pode produzir erros se alguns dos softwares instalados a partir dos PPAs individuais exigirem bibliotecas mais novas que o Ubuntu oficial.

Se você não encontrar erros durante a atualização, talvez esteja OK. No entanto, talvez seja necessário ativar a lista de repo menos restrita abaixo. Você pode substituir o conteúdo de /etc/apt/sources.list pela seguinte lista de repo:

#deb cdrom:[Ubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)]/ bionic main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic universe
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partner

deb http://security.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse

Links externos:

ISO do Ubuntu 18.04 (2 GB)

Gist Source para o Ubuntu completo 18.04 LTS /etc/sources.list (texto simples)

    

Answer 2

@RubberStamp ... Não consegui comentar na seção de comentários. Ele disse que o usuário não tem permissão para comentar este post.

De qualquer forma, não apenas para o atom, mas para qualquer pacote que eu tente instalar, a saída é

E: Unable to locate package "package-name"

ou

E: Package "package-name" has no installation candidate