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How can I upgrade Ubuntu 16.04.3 LTS to Ubuntu 20.04 LTS without Internet access?

M. darkaleh
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    Due to the huge changes between the releases any "upgrade" is strongly discouraged. Instead do your backups and the install from scratch with the installation/live media. – ChanganAuto Apr 27 '22 at 12:38
  • There is also no direct upgrade path. You need to update to 18.04 first and from there to 20.04. – pLumo Apr 27 '22 at 13:25
  • You can upgrade via reinstall desktop systems rather easily; though to re-install your additional manually-installed packages an internet connection is required (internet is required to download packages not found on the ISO/install media; if internet isn't detected this re-install manually-installed packages step is skipped & error given instead). You've tagged server though where it's less useful. – guiverc Apr 27 '22 at 22:52
  • @pLumo
    When I run the sudo do-release-upgrade in the command line environment, it connects to the Internet. And the problem is that my server is not connected to the Internet. If you have a solution, thank you for your help     – M. darkaleh Apr 28 '22 at 14:33

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Skipping over releases as you are trying to do is generally regarded as a bad package management decision and discouraged, especially if you don't have an internet connection. You should also think about whether Ubuntu 22.04 LTS would be a better choice for you than Ubuntu 20.04 LTS because it's newer and better. This is an ideal opportunity for you to do a fresh install of Ubuntu 22.04. If you don't have an internet connection don't select the options to download updates and third-party software when installing Ubuntu.

karel
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