[Bug 1515316] Re: distro upgrade bug

[berend]

I just had a problem that looked similar to yours, i.e. seeing:
KeyError: "The cache has no package named 'linux-generic-lts-utopic'

I had upgraded from 14.04 to 15.04, and then wanted to go to 15.10. It
seems that certain xserver/nvidia packages had been kept at trusty. I
removed them, and then it prompted to install the vivid versions
(although they were older). Unfortunately that led to a situation where
I couldn't boot X as the kernel headers were not installed.

Anyway, everything now working, perhaps, at 15.04. But upgrade still
fails. Stuck at calculating changes. My apt.log file is attached.

** Attachment added: "apt.log"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1515316/+attachment/4517316/+files/apt.log

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https://bugs.launchpad.net/bugs/1515316

Title:
  distro upgrade bug

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

Bug description:
  I can't upgrade from 15.04 to 15.10. The upgrade stops at calculating
  changes.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.3
  ProcVersionSignature: Ubuntu 3.16.0-45.60~14.04.1-generic 3.16.7-ckt14
  Uname: Linux 3.16.0-45-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1.7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Nov 11 14:21:54 2015
  InstallationDate: Installed on 2015-07-27 (106 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-11-11 (0 days ago)
  VarLogDistupgradeTermlog:

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