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I have Ubuntu 18.04 installed on my laptop and was trying to upgrade to 20.04. After disabling PPA sources and running the upgrade tool, I receive the "Could not calculate the upgrade" error.

The logs for Broken packages from /var/log/dist-upgrade/apt.log are available here. There seems to be +200 packages with conflicts including very important ones like python, so removing all of them as proposed in this answer is not an option. I have already tried apt remove and apt autoremove and removing 3rd party apt sources and the whole nine yards.

Considering that I haven't used this laptop for too long, it is very strange that the automatic update is impossible. Are there any other ways to force the upgrade using the do-release-upgrade tool?

Iman Akbari
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  • This might help: update upgrade 18.04 first. – Pierre ALBARÈDE Nov 09 '20 at 18:09
  • @PierreALBARÈDE thanks for the reply, I suppose you mean 19.04. how can I do that with do-release-upgrade? – Iman Akbari Nov 09 '20 at 18:24
  • I think there is no 19.04, you go directly to 20.04. The command is update-manager -c (in 20.04, I hope it also works in 18.04). You may also reinstall completely but you have a greater chance to wipe out your data. Upgrading saves about 3 GB compared to complete install. 20.10 is also available with some improvements but no long term support. – Pierre ALBARÈDE Nov 09 '20 at 18:30
  • @PierreALBARÈDE I have already run update upgrade dist-upgrade, any other way to avoid complete reinstall? – Iman Akbari Nov 10 '20 at 16:35
  • As I wrote, you can start from scratch. Backup as much as you can before. Take 20.04 for the long term support. – Pierre ALBARÈDE Nov 10 '20 at 16:42
  • Erratum : I withdraw that upgrading saves download bit count compared to full install. – Pierre ALBARÈDE Nov 10 '20 at 20:36

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