[Bug 1566540] Re: xserver lts-vivid packages not removed after upgrade

[malbo]

I did upgrade tests from 14.04 to 16.04 with VMware Player and found the same problem in the case of an upgrade from Ubuntu 14.04.2 (lts-utopic packages), 14.04.3 (lts-vivid packages) or 14.04.4 (lts-wily packages) : after upgrade, there remain lts-xxxx files that prevent the functioning of X. 
I suggest to consider the importance "High" instead of  "Undecided"

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https://bugs.launchpad.net/bugs/1566540

Title:
  xserver lts-vivid packages not removed after upgrade

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

Bug description:
  I upgraded from Trusty to Xenial and X would not start. After manually
  removing a bunch of -lts-vivid packages I had a desktop again.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.8
  ProcVersionSignature: User Name 4.4.0-16.32-generic 4.4.6
  Uname: Linux 4.4.0-16-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Apr  5 14:13:15 2016
  InstallationDate: Installed on 2015-10-16 (172 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2016-04-04 (1 days ago)
  VarLogDistupgradeTermlog:

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