I was finally able to proceed with the upgrade by:
- purging xserver and reinstalling (successful, but no luck with
do-release-upgrade)
- manually installing the held-back ati and radeon video drivers (successful,
but no luck with do-release-upgrade)
- removed all additional ppas (other software tab in software and updates
utility), including any ubuntu ones (I'd previously only removed 3rd party ones)
- did a more thorough cleanup of packages:
sudo apt-get --purge autoremove
sudo apt-get clean all
sudo apt-get purge $(dpkg -l | awk '/^rc/ { print $2 }')
The last command cleaned up a large amount of quite old stale packages.
I changed the software update options to notify me of any new version
(was set to LTS)
the re-ran the do-release-upgrade (without the -d option)
At that point I was successfully able to continue with the upgrade.
So my immediate pain is resolved. However it would have been nice for
the upgrade process to inform me of the specific invalid configuration
it had encountered, rather than stopping with only vague references to
possible conflicts with 3rd party packages, etc.
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https://bugs.launchpad.net/bugs/1744590
Title:
do-release-upgrade -d fails without information to resolve failure
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