[Bug 884152] Re: Error: Marking the upgrade (from 11.04 to 11.10) - unresolved package dependencies

[Cobalt]

I thought I had removed the xorg-edgers PPA before upgrading! In fact, there is no trace of it in sources.list or sources.listUpgrade, but there is in /etc/apt/sources.list.d.
The command
sudo ppa-purge xorg-edgers
gives the following
Warning:  Could not find package list for PPA: xorg-edgers ppa
Restarting the computer does not help. I still cannot install updates.
Could you help (perhaps by pointing to ubuntu resources on system administration or upgrades)?

Thank you very much.

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https://bugs.launchpad.net/bugs/884152

Title:
  Error: Marking the upgrade (from 11.04 to 11.10) - unresolved package
  dependencies

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

Bug description:
  As soon as I restarted my computer after upgrading from Ubuntu 11.04
  to 11.10, the error icon appeared on the top panel bar.

  If I try to run the update manager, I also get the following similar
  error.

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  Please report this bug against the 'update-manager' package and include the following error message:
  'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: update-manager-core 1:0.152.25.4
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  ApportVersion: 1.23-0ubuntu3
  Architecture: i386
  Date: Mon Oct 31 11:18:19 2011
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to oneiric on 2011-10-31 (0 days ago)

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