*** This bug is a duplicate of bug 1899000 ***
https://bugs.launchpad.net/bugs/1899000
Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides sane packages. This will prevent the upgrade as that
PPA contains package version numbers greater than the release to which
you are upgrading. You can revert the PPA by installing the ppa-purge
package from the official Ubuntu archive and then running 'sudo ppa-
purge ppa:sane-project/sane-git' or 'sudo ppa-purge ppa:sane-project
/sane-release' . After that you can try upgrading again and if it still
fails open a new bug report. Thanks and good luck!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
** Tags added: ppa sane-ppa
** This bug has been marked a duplicate of bug 1899000
Upgrade 18.04 --> 20.04 fails
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https://bugs.launchpad.net/bugs/1901551
Title:
I have tried several times to install the updtae evrsion from 18.04 to
20.04. Each time, I have the same answer : There was an unsolvable
problem during the upgrade calculation. This was probably caused
by: * unofficial software packages that are not from Ubuntu. Please
use the "ppa-purge" command from the package "Ppa-purge" to remove
packets from a PPA Launchpad repository, and then try to rerun the
upgrade.
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