I am trying to upgrade to Ubuntu 21.10 as it is released now but the updater only shows version 21.04. Even if I try to upgrade to 21.04 first: as soon as it comes to the point to upgrade something with the package resources it does only say that there is some error which most likely was caused by packages not supported by Ubuntu or something like that and it tells me to use ppa-purge command from the ppa-purge package to delete launchpad apps. I don't understand this. Please help! How do I upgrade from Ubuntu 20.04 to Ubuntu 21.10?
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You can indeed only upgrade from one Ubuntu version to the next, or from one LTS release (Long Term Support release) to the next. 20.04 is a LTS. You can upgrade to 21.04, but you also will be able to upgrade to the next LTS, 22.04.
The system may not be customized too much in order to upgrade.
Disable any PPA you added
Fully update your system before attempting the upgrade:
sudo apt update sudo apt upgrade sudo apt dist-upgrade
Then you can update with
sudo do-release-upgrade
If you do not get the update going, then the shortest pain will be a fresh install - overwriting your existing installation. Technically, that is by far the best, even though you then need to restore all your customizations.
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