O Zesty já é EOL, de acordo com o link Minha sugestão seria atualizar para a última versão suportada do Ubuntu
Além disso, você pode dar uma olhada aqui: link
quando executo o comando sudo apt-get update
, recebo estes erros:
E: The repository 'http://in.archive.ubuntu.com/ubuntu zesty-updates Release' does no longer have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://in.archive.ubuntu.com/ubuntu zesty-backports Release' does no longer have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details