software-center crashed with KeyError in __getitem__(): "The cache has no package named 'xfsprogs'"

[Zephyr]

Binary package hint: software-center

appears when I have tried to install cairo-clock without internet connection

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: software-center 3.1.26.4
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CheckboxSubmission: 52411fe8b29896970a09af9dcb81231f
CheckboxSystem: 0531969bcfd4f03af7405c98dc94a948
Date: Sun Apr 17 20:00:56 2011
ExecutablePath: /usr/share/software-center/software-center
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110329.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center gparted/Редактор\ разделов\ диска\ GNOME
ProcEnviron:
 SHELL=/bin/bash
 LANGUAGE=ru_RU:en
 LANG=ru_RU.UTF-8
PythonArgs: ['/usr/bin/software-center', 'gparted/\xd0\xa0\xd0\xb5\xd0\xb4\xd0\xb0\xd0\xba\xd1\x82\xd0\xbe\xd1\x80 \xd1\x80\xd0\xb0\xd0\xb7\xd0\xb4\xd0\xb5\xd0\xbb\xd0\xbe\xd0\xb2 \xd0\xb4\xd0\xb8\xd1\x81\xd0\xba\xd0\xb0 GNOME']
SourcePackage: software-center
Title: software-center crashed with KeyError in __getitem__(): "The cache has no package named 'xfsprogs'"
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin nopasswdlogin 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 #729225, 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.