root@MaCoGa:~# apt update
Ign:1 http://security.ubuntu.com/ubuntu cosmic-security InRelease
Ign:2 http://us.archive.ubuntu.com/ubuntu cosmic InRelease
Err:3 http://security.ubuntu.com/ubuntu cosmic-security Release
  404  Not Found [IP: 91.189.91.38 80]
Ign:4 http://us.archive.ubuntu.com/ubuntu cosmic-updates InRelease
Ign:5 http://us.archive.ubuntu.com/ubuntu cosmic-backports InRelease
Err:6 http://us.archive.ubuntu.com/ubuntu cosmic Release
  404  Not Found [IP: 91.189.91.38 80]
Err:7 http://us.archive.ubuntu.com/ubuntu cosmic-updates Release
  404  Not Found [IP: 91.189.91.38 80]
Err:8 http://us.archive.ubuntu.com/ubuntu cosmic-backports Release
  404  Not Found [IP: 91.189.91.38 80]
Reading package lists... Done
E: The repository 'http://security.ubuntu.com/ubuntu cosmic-security Release' no longer has 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://us.archive.ubuntu.com/ubuntu cosmic Release' no longer has 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://us.archive.ubuntu.com/ubuntu cosmic-updates Release' no longer has 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://us.archive.ubuntu.com/ubuntu cosmic-backports Release' no longer has 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.
root@MaCoGa:~#