update ubuntu 17.10

Salve a tutti ho un problema con l update del mio ubuntu 17.10..potreste aiutarmi?? in output ad upadate mi da la seguente cosa:

Ign:1 http://it.archive.ubuntu.com/ubuntu artful InRelease Ign:2 http://security.ubuntu.com/ubuntu artful-security InRelease Trovato:3 http://download.virtualbox.org/virtualbox/debian artful InRelease Ign:4 http://it.archive.ubuntu.com/ubuntu artful-updates InRelease
Err:5 http://security.ubuntu.com/ubuntu artful-security Release
404 Not Found [IP: 91.189.88.162 80] Ign:6 http://it.archive.ubuntu.com/ubuntu artful-backports InRelease Err:7 http://it.archive.ubuntu.com/ubuntu artful Release 404 Not Found [IP: 90.147.160.73 80] Err:8 http://it.archive.ubuntu.com/ubuntu artful-updates Release 404 Not Found [IP: 90.147.160.73 80] Err:9 http://it.archive.ubuntu.com/ubuntu artful-backports Release 404 Not Found [IP: 90.147.160.73 80] Lettura elenco dei pacchetti... Fatto E: The repository 'http://security.ubuntu.com/ubuntu artful-security Release' does not 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://it.archive.ubuntu.com/ubuntu artful Release' does not 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://it.archive.ubuntu.com/ubuntu artful-updates Release' does not 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://it.archive.ubuntu.com/ubuntu artful-backports Release' does not 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.