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Attempting to upgrade from 18.04 to 20.04 using:

sudo do-release-upgrade -d -f DistUpgradeViewGtk3

This fails with the message:

An unresolvable problem occurred while calculating the upgrade.

This was likely caused by: * Unofficial software packages not provided by Ubuntu Please use the tool 'ppa-purge' from the ppa-purge package to remove software from a Launchpad PPA and try the upgrade again.

Prior to this I get a notice that third-party sources are being disabled for the upgrade.

The contents of main.log is Here

It says at the end:

2020-07-26 08:53:18,226 WARNING Can't mark 'ubuntu-desktop' for upgrade (E:Unable to correct problems, you have held broken packages.) 2020-07-26 08:53:28,026 ERROR Dist-upgrade failed: 'Broken packages after upgrade: ubuntu-desktop'

As a result, I have tried all of the broken packages solutions I could find, none of which have worked. Running synaptic package manager and filtering by broken finds no packages.

I have installed ppa-purge but without an idea of which packages to remove with it, I haven't actually used it.

k.child90
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    That is what you will need to do: remove any non standard PPA's with ppa-purge, so the software and libraries these introduced are removed. In your log, many foreign PPA's are listed. To be honest, a clean install will by far be the fastest and the cleanest solution. – vanadium Jul 26 '20 at 08:19

1 Answers1

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I had this same problem and was able to resolve it using this answer https://askubuntu.com/a/646918/309267

Update: The above answer didn't help on my second computer but this one works great https://askubuntu.com/a/1242078

user1950498
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