[Bug 1005943] [NEW] Upgrade from 11.10 to 12.04 fails - says package unity-2d is marked for removal

[Deuce1912]

Public bug reported:

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.10
DISTRIB_CODENAME=oneiric
DISTRIB_DESCRIPTION="Ubuntu 11.10"

update-manager:
  Installed: 1:0.152.25.11
  Candidate: 1:0.152.25.11
  Version table:
 *** 1:0.152.25.11 0
        100 /var/lib/dpkg/status
******************************************

I expected Ubuntu to upgrade from Ocelot to Precise but it threw up an
error stating that it couldn't continue because unity-2d was marked for
removal.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: update-manager 1:0.152.25.11
ProcVersionSignature: Ubuntu 3.0.0-20.34-generic 3.0.30
Uname: Linux 3.0.0-20-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Tue May 29 07:34:05 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to oneiric on 2012-05-29 (0 days ago)

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade oneiric

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https://bugs.launchpad.net/bugs/1005943

Title:
  Upgrade from 11.10 to 12.04 fails - says package unity-2d is marked
  for removal

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

Bug description:
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=11.10
  DISTRIB_CODENAME=oneiric
  DISTRIB_DESCRIPTION="Ubuntu 11.10"

  update-manager:
    Installed: 1:0.152.25.11
    Candidate: 1:0.152.25.11
    Version table:
   *** 1:0.152.25.11 0
          100 /var/lib/dpkg/status
  ******************************************

  I expected Ubuntu to upgrade from Ocelot to Precise but it threw up an
  error stating that it couldn't continue because unity-2d was marked
  for removal.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: update-manager 1:0.152.25.11
  ProcVersionSignature: Ubuntu 3.0.0-20.34-generic 3.0.30
  Uname: Linux 3.0.0-20-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  Date: Tue May 29 07:34:05 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to oneiric on 2012-05-29 (0 days ago)

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