[Bug 877427] Re: insufficient information when upgrade to Ubuntu 12.04 fails

[harlie dills]

in my case the message displayed says ; ( unresolvable problem occoured
while calculating the upgrade the package'unity' is marked for removal
but it is in the removal blacklist)   this is followed by the possible
causes of which none apply

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https://bugs.launchpad.net/bugs/877427

Title:
  insufficient information when upgrade to Ubuntu 12.04 fails

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

Bug description:
  When using upgrade manager to update to Ubuntu `12.04, it fails saying
  "could not determine the upgrade", citing an unrecoverable problem
  when calculating the upgrade. E:Error, pkgProblemResolver::Resolve
  generated breaks, this may be caused by held packages.

   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 update-manager' in a terminal.

  It would be very helpful if the error report included information on which installed packages are in conflict with the upgrade, as
  right now you are left completely in the dark.  A painful work around is to format your drive and install 12.04 from scratch,
  and then reinstall any additional packages as needed.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: update-manager 1:0.150.3
  ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Tue Oct 18 14:19:05 2011
  EcryptfsInUse: Yes
  GConfNonDefault:
   /apps/update-manager/check_new_release_ignore=
   /apps/update-manager/first_run=false
   /apps/update-manager/show_details=true
   /apps/update-manager/window_size=(500,622)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to natty on 2011-10-18 (0 days ago)

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