Trying to upgrade from 10.04 to 10.10 fails at 'Software Channels'

[David Ritchie]

Binary package hint: update-manager

Version I'm using:
Description: Ubuntu 10.04.1 LTS
Release: 10.04

Version of package:
update-manager:
  Installed: 1:0.134.10
  Candidate: 1:0.134.10
  Version table:
 *** 1:0.134.10 0
        500 http://gb.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     1:0.134.7 0
        500 http://gb.archive.ubuntu.com/ubuntu/ lucid/main Packages

When upgrading from 10.04 to 10.10 I get the message:

Invalid package information

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 against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bug report

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: ubuntu-minimal 1.197
ProcVersionSignature: Ubuntu 2.6.32-25.44-generic 2.6.32.21+drm33.7
Uname: Linux 2.6.32-25-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Oct 12 20:49:24 2010
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: ubuntu-meta

[Jean-Baptiste Lallement (jibel)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 631426, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.