does not upgrade 11.04 to 11.10

[maMD.MUSTAKIM]

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 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 1:0.150.5.1
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic i686
Architecture: i386
Date: Sat Jan 14 11:09:36 2012
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=oneiric
 /apps/update-manager/first_run=false
 /apps/update-manager/window_size=(600,600)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2012-01-14 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2012-01-14 10:09:12.556879
 Log time: 2012-01-14 10:17:48.765088
 Log time: 2012-01-14 10:19:03.784568
VarLogDistupgradeApttermlog:

VarLogDistupgradeHistorylog:

VarLogDistupgradeSystemstatetargz:

VarLogDistupgradeTermlog:

[Bryan Quigley (bryanquigley)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner. This release has reached EOL so I'm going to close this bug. If you have similar issues in the future please do report them.