sempre que eu corro:
sudo apt-get update
Eu recebo esta mensagem abaixo:
W: The repository 'cdrom://Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1) 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.
W: The repository 'ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/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 cdrom://Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)/dists/xenial/main/binary-amd64/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
E: Failed to fetch cdrom://Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)/dists/xenial/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
E: Failed to fetch ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Failed to fetch ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
eu usei
sudo nano /etc/apt/sources.list
e comente ou remova linhas que incluam cdrom. por exemplo:
deb cdrom:[Ubuntu-Server 16.04 LTS Xenial Xerus - Release amd64 (20160420.3)]/ xenial main restricted>
Eu consegui removê-lo. quando eu corri sudo apt-get update , recebi a mensagem de erro abaixo.
W: The repository 'http://ppa.launchpad.net/ubuntu-on-rails/ppa/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/ubuntu-on-rails/ppa/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
alguém poderia lançar alguma luz sobre isso, por favor? Graças um milhão de antecedência.
O ppa que você está usando não tem pacotes disponíveis para 16.04, esse é o significado do erro 404.
Desabilite o ppa ou entre em contato com o mantenedor.
Veja também Como posso consertar um erro 404 ao usar um PPA ou atualizar minhas listas de pacotes?