Comment 2 for bug 1927204

Thank you for taking the time to report this issue and helping to make Ubuntu better.

The error message you likely saw says

"* 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."

The ppa-purge tool doesn't just disable sources, but removes the packages that were installed from those sources. It's the installed packages that create the problem in upgrade.

I looked and do see evidence of 3rd party (PPA) packages present, so I suggest support is in order.

I've marked this incomplete, as you haven't followed the PPA purge instructions and removed all 3rd party software before upgrade to proceed. If you believe I'm in error, or have missed something, please leave a comment explaining why, and you can return the status to "New".