[Bug 1582755] Re: Ubuntu prevents upgrading from 15.10 to 16.04

[Stéphane Charette]

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.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
https://bugs.launchpad.net/bugs/1582755

Title:
  Ubuntu prevents upgrading from 15.10 to 16.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Upgrade tells me it cannot upgrade from 15.10 to 16.04 due to one of
  three possible situations, but it is sorely lacking in details to help
  users track down the cause of the problem.  All I see is the
  following:

  An unresolvable problem occurred while calculating the upgrade.
  This can be caused by:
  * Upgrading to a pre-release version of Ubuntu
  * Running the current pre-release version of Ubuntu
  * Unofficial software packages not provided by Ubuntu

  I'm relatively certain that cause 1 and cause 2 don't apply.  If the
  problem is due to an unofficial software package, then it should name
  it or perhaps have a switch to do-release-upgrade to ignore it.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-36.42-generic 4.2.8-ckt8
  Uname: Linux 4.2.0-36-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue May 17 10:17:42 2016
  InstallationDate: Installed on 2014-07-07 (679 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-05-17 (0 days ago)
  mtime.conffile..etc.update.manager.release.upgrades: 2015-08-06T09:39:05

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1582755/+subscriptions