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".
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1927204
Title:
Upgrade to 20.04 crashes even after disabling all 3rd party software
sources
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