Finally figured out why upgrades to 16.04 are prevented on many of my
computers. The trick is to run this after a failed upgrade:
> cd /var/log/dist-upgrade/
> tail -100 main.log
In my case, this was the problem:
> 2016-06-09 15:48:07,039 DEBUG blacklist expr '^postgresql-.*[0-9]\.[0-9].*'
> matches 'postgresql-plperl-9.4'
> 2016-06-09 15:48:07,039 DEBUG The package 'postgresql-plperl-9.4' is marked
> for removal but it's in the removal blacklist
> 2016-06-09 15:48:12,070 ERROR Dist-upgrade failed: 'The package
> 'postgresql-plperl-9.4' is marked for removal but it is in the removal
> blacklist.'
> 2016-06-09 15:48:12,071 DEBUG abort called
So the solution for me was to remove that package:
> sudo apt-get remove postgresql-plperl-9.4
However, even knowing this, I still think this bug is valid. The
upgrade process should provide more details when the upgrade refuses to
run. For example, it could have either shown the name of the offending
package, or perhaps even given me the option to remove it so the upgrade
can proceed.
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https://bugs.launchpad.net/bugs/1582755
Title:
Ubuntu prevents upgrading from 15.10 to 16.04
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