Today I tried upgrading from Kubuntu 22.04 to 23.10 using the following command:

sudo do-release-upgrade

It went through the motions then came up with the following error 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.


   I read up on ppa-purge and  gathered that it will uninstall a
   program that was installed via a purged ppa if there isn't an
   earlier version in one of the official Ubuntu repositories.

   How am I supposed to know what ppa to purge?  Am I supposed to go
   through them one at a time until the upgrade is successful? I
   imagine a horror story of purging a bunch of programs, not
   remembering what they are then finding out over the next few weeks
   as I try to run a program only to find it's not there and figuring
   out how to reinstall it again.

   Or is there something I'm missing?

   thanks
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