[Bug 1372798] Re: unable to upgrade to 14.04 LTS.

[Steve Nadeau]

Hi!
you have a broken system, please run in a terminal :
sudo apt-get update
sudo apt-get install -f 

try to upgrade from here:

in a terminal:
sudo do-release-upgrade

if it doesn't work, you have a lot of kernel installed but not the last
one for 12.04.5, it will be a good thing to upgrade your system before
to be sure your system is OK.

in a terminal:
sudo apt-get install linux-lts-trusty

try to upgrade from here:

in a terminal:
sudo do-release-upgrade


if it doesn't work, then you may have some PPA installed, that may be a
source of problems, maybe you will have to remove them, this may be
problematic and complicated cause it will be like a puzzle to get back
to a normal and stable state.


at this point, it may be a good idea to have a technician with you or you will have to learn a lot of how to purge a lot of packages (don't ever remove network-manager and other basic packages). It may be a lot complicated at this point, may be better to reinstall the system from scratch, but don't forget to make a backup of  all your system before. 

hope it may help you.

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https://bugs.launchpad.net/bugs/1372798

Title:
  unable to upgrade to 14.04 LTS.

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  Some unknown error prevents from upgrading to 14.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
  Uname: Linux 3.5.0-18-generic i686
  ApportVersion: 2.0.1-0ubuntu17.7
  Architecture: i386
  Date: Tue Sep 23 17:37:04 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1411456939
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 587
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2014-09-23 (0 days ago)
  VarLogDistupgradeTermlog:

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