software-center crashed with Package keepassx isn't available in _run_transaction()

[Walter Da Col]

I changed repository mirror then I tried to install keepassx, a popup tell me that this package doesn't exit then crashed.

ProblemType: RecoverableProblem
DistroRelease: Ubuntu 13.04
Package: software-center 5.6.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
Date: Mon Apr 8 12:44:49 2013
DuplicateSignature: software-center:trans-failed:error-no-package
ExecutablePath: /usr/share/software-center/software-center
InstallationDate: Installed on 2013-04-03 (4 days ago)
InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130311.1)
InterpreterPath: /usr/bin/python2.7
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center
SourcePackage: software-center
Title: software-center crashed with Package keepassx isn't available in _run_transaction()
Traceback:
 Traceback (most recent call last):
   File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 990, in _run_transaction
     yield trans.run(defer=True)
 TransactionFailed: Transaction failed: Package does not exist
  Package keepassx isn't available
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1154031, 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.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Zephyr (pasha-pivo)]

Somehow the bug #1154031 managed to disappear. At least such a web page does not exist.
Anyway, I came across the same problem the OP had faced. This time this happened when I tried to install the 2048 game through Software Manager.