[Bug 1608329] Re: Cannot upgrade from 14.04 to 16.04

[Brian Murray]

You seem to have both the kubuntu-desktop metapackage and the ubuntu-desktop metapackage installed.  Having two metapackages installed can create a complicated upgrade for the release upgrader and this time it wasn't able to figure out the upgrade path.  I'd suggest removing one of the metapackages and try the upgrade again.  The messages I used to determine this appear in VarLogDistupgradeMainlog.txt:
2016-07-31 19:21:01,426 DEBUG Marking 'ubuntu-desktop' for upgrade
2016-07-31 19:21:01,522 DEBUG Marking 'kubuntu-desktop' for upgrade
2016-07-31 19:21:02,571 WARNING Can't mark 'kubuntu-desktop' for upgrade (E:Unable to correct problems, you have held broken packages.)
2016-07-31 19:21:02,572 DEBUG metapkg 'ubuntu-desktop' installed but marked_delete
2016-07-31 19:21:02,572 DEBUG metapkg 'ubuntu-desktop' installed but marked_delete
2016-07-31 19:21:02,752 DEBUG blacklist expr 'ubuntu-desktop$' matches 'ubuntu-desktop'
2016-07-31 19:21:02,752 DEBUG The package 'ubuntu-desktop' is marked for removal but it's in the removal blacklist


** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1608329

Title:
  Cannot upgrade from 14.04 to 16.04

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

Bug description:
  Could not calculate the upgrade

  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

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-93-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Jul 31 19:21:40 2016
  InstallationDate: Installed on 2015-02-24 (523 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-01 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2016-07-31T18:56:43.471798

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