software-center crashed with SystemError in mark_install()

[josa]

Binary package hint: software-center

Newly installed Ubuntu 10.10
Got this as I clicked at 'More info' for Ubuntu One. Did not notice any real problems with Software Center. The same crash message came after I fail to install Ubuntu One as there where dependency problems.
Install problems or something else about Ubuntu One probably related to the crashes as there where no problems installing Ubuntu restricted extras or Bughugger.

ProblemType: Crash
DistroRelease: Ubuntu 10.10
Package: software-center 2.1.15
ProcVersionSignature: Ubuntu 2.6.35-19.28-generic 2.6.35.3
Uname: Linux 2.6.35-19-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Sat Sep 4 09:48:47 2010
ExecutablePath: /usr/share/software-center/software-center
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
InterpreterPath: /usr/bin/python2.6
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-center']
SourcePackage: software-center
Title: software-center crashed with SystemError in mark_install()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #624541, so 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.