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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://mirror.ps.kz/ubuntu disco-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://mirror.ps.kz/ubuntu disco-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.

Buzz Bee
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  • Ubuntu 19.04 is EOL or end-of-life (http://fridge.ubuntu.com/2020/01/23/ubuntu-19-04-disco-dingo-end-of-life-reached-on-january-23-2020/) thus off-topic on this site (https://askubuntu.com/help/on-topic) unless your question is specific to help moving to a supported release of Ubuntu. Use a LTS or long-term-support release if you don't like release-upgrading every 6-9 months. https://help.ubuntu.com/community/EOLUpgrades – guiverc Apr 26 '20 at 10:48
  • Your issue is 'disco' (19.04) is EOL. After a release goes EOL, mirrors can drop it, and the main archive.ubuntu.com gets moved to old-releases. Refer to prior comment and EOLUpgrades link, or https://askubuntu.com/questions/91815/how-to-install-software-or-upgrade-from-an-old-unsupported-release – guiverc Apr 26 '20 at 10:48
  • To upgrade to new version of Ubuntu, type sudo do-release-upgrade, and then "yes" when asked. This may take an hour or two depending on your hardware and internet connection. – Johannes Lemonde Apr 27 '20 at 07:14

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To upgrade to new version of Ubuntu, type sudo do-release-upgrade, and then "yes" when asked. This may take an hour or two depending on your hardware and internet connection. – Johannes Lemonde thanks Johannes Lemonade it helped for me

Buzz Bee
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