Partial upgrade fails with calculation error

[Keith Clark]

Binary package hint: update-manager

Here is the error I get:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade:
The package 'ubuntu-desktop' is marked for removal but it is in the removal blacklist.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

This is most likely a transient problem, please try again later.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.133.11
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic i686
Architecture: i386
Date: Fri Apr 9 14:21:29 2010
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager

[Keith Clark (keithclark)]

Sorry, this is upgrading with Ubuntu 10.04 Beta1 to Beta2

[Jean-Baptiste Lallement (jibel)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please add the log files from '/var/log/dist-upgrade/' to this bug report as separate attachments? Thanks in advance.

[Kieran Fleming (kieran-fleming)]

This is happening for me in Mythbuntu (upgrading 9.10 to 10.04)