[Bug 1137290] [NEW] Attempting to upgrade to Ubuntu version 11.10 using Update Manager fails with error "essential package 'ubuntu-minimal' can not be found anymore"

[Byron Henning]

Public bug reported:

Full error text:

After your package information was updated the essential package 'ubuntu-minimal' can not be found anymore.
This indicates a serious error, please report this bug using the command 'ubuntu-bug update-manager' in a terminal and include the files in /var/log/dist-upgrade/ in the bug report.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Fri Mar  1 09:30:43 2013
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_ZA:en
 LANG=en_ZA.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2013-03-01 (0 days ago)

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


** Tags: apport-bug dist-upgrade i386 natty running-unity

** Attachment added: "Contents of "var/log/dist-upgrade/""
   https://bugs.launchpad.net/bugs/1137290/+attachment/3552447/+files/dist-upgrade-files.tar.gz

** Tags added: dist-upgrade

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https://bugs.launchpad.net/bugs/1137290

Title:
  Attempting to upgrade to Ubuntu version 11.10 using Update Manager
  fails with error "essential package 'ubuntu-minimal' can not be found
  anymore"

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

Bug description:
  Full error text:

  After your package information was updated the essential package 'ubuntu-minimal' can not be found anymore.
  This indicates a serious error, please report this bug using the command 'ubuntu-bug update-manager' in a terminal and include the files in /var/log/dist-upgrade/ in the bug report.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: update-manager 1:0.150.2
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Fri Mar  1 09:30:43 2013
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_ZA:en
   LANG=en_ZA.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to natty on 2013-03-01 (0 days ago)

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