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failed update: N: See apt-secure(8) manpage for repository creation and user configur

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Hi,

here is my log,

any idea?

thanks for the attention.

HTML Code:

~$ sudo apt-get update
Ign:1 http://it.archive.ubuntu.com/ubuntu cosmic InRelease
Ign:2 http://it.archive.ubuntu.com/ubuntu cosmic-updates InRelease
Ign:3 http://it.archive.ubuntu.com/ubuntu cosmic-backports InRelease
Err:4 http://it.archive.ubuntu.com/ubuntu cosmic Release
  404  Not Found [IP: 90.147.160.72 80]
Err:5 http://it.archive.ubuntu.com/ubuntu cosmic-updates Release
  404  Not Found [IP: 90.147.160.72 80]
Err:6 http://it.archive.ubuntu.com/ubuntu cosmic-backports Release
  404  Not Found [IP: 90.147.160.72 80]
Ign:7 http://security.ubuntu.com/ubuntu cosmic-security InRelease
Err:8 http://security.ubuntu.com/ubuntu cosmic-security Release
  404  Not Found [IP: 91.189.91.24 80]
Reading package lists... Done
E: The repository 'http://it.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://it.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://it.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.
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.
~$


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