Eu sou um noob completo sobre o Ubuntu e usá-lo no meu PC do escritório.
Estes são os detalhes da minha divulgação:
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
Eu o usei sem encontrar nenhum problema nos últimos 6 a 9 meses. Eu tenho o hábito de atualizar o sistema uma vez por semana (sudo apt-get update, sudo apt-get upgrade e sudo apt-get dist-upgrade) e tudo parecia funcionar perfeito até cerca de 2 semanas atrás.
Nas últimas duas semanas, porém, a execução desses comandos começou a retornar vários erros. Meu LibreOffice também estava corrompido e eu o desinstalei para instalar um limpo, mas para minha surpresa não posso instalar uma nova versão também. Eu segui muitos tópicos aqui e fiz uma dúzia de coisas, que eu tenho medo de exacerbar o meu problema. Tentei mudar os servidores e tudo, e no processo meu Software e Atualizações pararam de funcionar completamente.
Somente meu Gerenciador de Pacotes Synaptic e ele também retorna o seguinte erro quando tentei recarregar os pacotes.
Esta é a mensagem que recebo no Gerenciador de Pacotes Synaptic.
The repository 'http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial Release' does not have a Release file.
Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
See apt-secure(8) manpage for repository creation and user configuration details.
Failed to fetch http://ppa.launchpad.net/shutter/ppa/ubuntu/dists/xenial/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Failed to fetch http://ppa.launchpad.net/teejee2008/ppa/ubuntu/dists/xenial/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Failed to fetch http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
Some index files failed to download. They have been ignored, or old ones used instead.
Estes são os conteúdos das minhas sources.list
#------------------------------------------------------------------------------#
# OFFICIAL UBUNTU REPOS #
#------------------------------------------------------------------------------#
###### Ubuntu Main Repos
deb http://in.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
###### Ubuntu Update Repos
deb http://in.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://in.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
sudo apt-get update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release
Hit:3 http://in.archive.ubuntu.com/ubuntu xenial InRelease
Hit:5 http://in.archive.ubuntu.com/ubuntu xenial-security InRelease
Hit:6 http://ppa.launchpad.net/apt-fast/stable/ubuntu xenial InRelease
Hit:7 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease
Ign:8 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial InRelease
Hit:9 http://ppa.launchpad.net/libreoffice/ppa/ubuntu xenial InRelease
Hit:10 http://ppa.launchpad.net/mc3man/xerus-media/ubuntu xenial InRelease
Hit:11 http://ppa.launchpad.net/nemh/systemback/ubuntu xenial InRelease
Get:12 http://ppa.launchpad.net/shutter/ppa/ubuntu xenial InRelease [1,005 B]
Err:12 http://ppa.launchpad.net/shutter/ppa/ubuntu xenial InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Get:13 http://ppa.launchpad.net/teejee2008/ppa/ubuntu xenial InRelease [1,005 B]
Err:13 http://ppa.launchpad.net/teejee2008/ppa/ubuntu xenial InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Ign:14 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial Release
Ign:15 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en
Ign:15 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en
Ign:15 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en
Ign:15 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en
Ign:15 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en
Err:15 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main amd64 Packages
404 Not Found
Ign:16 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial/main Translation-en
Fetched 2,010 B in 42s (47 B/s)
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/shutter/ppa/ubuntu/dists/xenial/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: Failed to fetch http://ppa.launchpad.net/teejee2008/ppa/ubuntu/dists/xenial/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: Failed to fetch http://ppa.launchpad.net/fossfreedom/packagefixes/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.