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I run the update manager from the terminal and I click the "Upgrade" button in its popup window, this is what happens in the terminal

update-manager -c
Checking for a new Ubuntu release
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
http://www.ubuntu.com/releaseendoflife

Please install all available updates for your release before upgrading.
user1632812
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  • my queston is in English

    The Ubuntu isntallation I'm running is set to Italian though

     – user1632812 Jan 30 '22 at 06:48
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    Try running LANG=en_US.UTF-8 bash before the command to translate it to English! – Error404 Jan 30 '22 at 06:51
  • ok, I did as suggested and edited the question, thanks – user1632812 Jan 30 '22 at 06:56
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    Your system is not supported anymore, you have to upgrade through reinstalling, thats the only option! – Error404 Jan 30 '22 at 06:57
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    Please ensure you've applied all upgrades as per the message; ie. sudo apt update to ensure software lists are updated (no errors or warnings were given) then sudo apt full-upgrade to ensure all available upgrades are applied. Assuming no error messages or warnings exist there; I'd try again (if you get warnings of holds* existing on any packages in messages; you'll need to revert/remove those holds). Do note there are cases where apt upgrade cannot apply all upgrades! which is why you need to use full-upgrade – guiverc Jan 30 '22 at 07:13
  • sudo apt update laments that it can't find cdrom://Ubuntu 20.10 Groovy Gorilla - Release amd64 (20201022) groovy InRelease – user1632812 Jan 30 '22 at 07:24
  • partially, yes. Thank you – user1632812 Jan 30 '22 at 07:33
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    Comment out the CDROM; which is how installation media is referred to (even if it was on thumb-drive or modern media; it's referred to as CDROM). - the following will be helpful; but note HIRSUTE or 21.04 hasn't yet moved to old-releases; so the duplicate link isn't required yet (but will be in hours/days) See https://askubuntu.com/questions/42441/how-do-remove-the-cd-dvd-install-as-a-source-for-apt-get-packages-when-install – guiverc Jan 30 '22 at 08:14

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