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Following the procedure:

  1. Upgrade all installed packages of Ubuntu version 18.04 by running sudo apt update && sudo apt upgrade command.
  2. Reboot the Ubuntu Linux system by tying the sudo reboot command
  3. Install the Ubuntu update tool, run: sudo apt install update-manager-core
  4. Start the upgrade procedure, run: sudo do-release-upgrade

Here I get stuck and this is the output:

$ sudo do-release-upgrade
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.

But I completed the previous steps with no errors.

How can I upgrade my Xubuntu from 16.04 to 20.04? It seems that some packages are impossible to upgrade and this may cause the upgrade to fail. I will investigate deeply. In the meanwhile, any suggestion is appreciated.

Leos313
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  • You can't directly upgrade from 16.04 to 20.04. You can upgrade to 18.04. Try to run do-release-upgrade without sudo. – Pilot6 Dec 20 '20 at 09:13
  • Does this answer your question? Error message "sudo: unable to resolve host (none)" – Pilot6 Dec 20 '20 at 09:13
  • trying and updating the question asap! – Leos313 Dec 20 '20 at 09:29
  • @Pilot6. without sudo same output – Leos313 Dec 20 '20 at 09:30
  • @Pilot6, how to pass from 16.04 to 18.04? Suggestion? – Leos313 Dec 20 '20 at 09:32
  • You need to fix sudo first. I gave a link. – Pilot6 Dec 20 '20 at 09:33
  • doing right now! – Leos313 Dec 20 '20 at 09:33
  • @Pilot6, sudo fixed with echo $(hostname -I | cut -d\ -f1) $(hostname) | sudo -h 127.0.0.1 tee -a /etc/hosts. Rebooting, and the problem is still there! – Leos313 Dec 20 '20 at 09:42
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    sudo apt full-upgrade is usually used to fully upgrade a system (it won't bump you to the next release unless you've wrongly hacked your sources). apt upgrade can in certain circumstances leave some upgrades behind (why the full-upgrade command exists). If you have issues and have tried sudo apt full-upgrade (or sudo apt-get dist-upgrade) your issue could be your sources (ie. read sudo apt update & it's messages looking for missing lines) – guiverc Dec 20 '20 at 10:23
  • @guiverc yes, this was exactly the problem. I just completely removed the package that was causing the problem and now the upgrade of Xubuntu is going on. The packages were (1) https://askubuntu.com/questions/1132184/vdpau-va-driver-has-unmet-dependencies-on-ubuntu-16-04-any-official-resolutio and (2) https://askubuntu.com/questions/1167967/apt-get-update-issue-with-pinta-repository . I will write an answer to this question as soon as the whole upgrade is complete – Leos313 Dec 20 '20 at 10:27

1 Answers1

2

Solution:

After an investigation, it seems that there were two packages causing the problems: Pinta and some other unknown packages of Kodi. Simply, the system is not able to upgrade them or the repositories are not reachable. The two useful links I have read are this and this other one. It is true that I did not think that these packages were crucial for the system to complete the process. Howerever they were.

So I simply uninstall them with sudo apt-get autoremove --purge <package_name> and the process sudo do-release-upgrade continues with no problems anymore.

General Solution: if you have similar errors/problems, try to solve all the update/upgrade one by one before the sudo do-release-upgrade.

In my case, it automatically and autonomously passed from 16.04 to 18.04 and, then, from 18.04 to 20.04.

Leos313
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