[Bug 1509025] Re: System update from Kubuntu 15.04 to 15.10 fails.

[Brian Murray]

It is not enough to just disable third party sources, you also need to
ensure that the packages provided by the third party source are not
versions greater than the release to which you are trying to upgrade.
You could use the tool ppa-purge to disable the PPAs and downgrade the
package versions to the ones from vivid.

The issue is likely the with some xserver-xorg packages you have
installed.

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

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https://bugs.launchpad.net/bugs/1509025

Title:
  System update from Kubuntu 15.04 to 15.10 fails.

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

Bug description:
  Running Kubuntu 15.04. I got the update prompt, but the update fails
  after finishing step 2 (configuring new update sources I believe). I
  disabled all 3rd party sources from package mmanager and tried again,
  but it didn't help. Reboot also did not help.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.2
  ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-31-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Thu Oct 22 19:18:38 2015
  InstallationDate: Installed on 2014-11-02 (354 days ago)
  InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-10-22 (0 days ago)
  VarLogDistupgradeTermlog:

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