Error message: An unhandleable error occured

[Hugh A Barlow]

The error message starts with "An unhandleable error occured." The next two lines state, "There seems to be a programming error in aptdaemon, the software that allows you to install/remove software and to perform other package management related tasks." Under Details, the message continues with, "Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 968, in simulate
    trans.unauthenticated = self._simulate_helper(trans)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1092, in _simulate_helper
    return depends, self._cache.required_download, \
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 235, in required_download
    pm.get_archives(fetcher, self._list, self._records)
SystemError: E:I wasn't able to locate a file for the ttf-mscorefonts-installer package. This might mean you need to manually fix this package.:

This problem first occurred when I tried installing Wine. Wine hung up at about 66% install. After a couple of hours of no improvement, I rebooted and was able to clear the Software Center, but nothing else would install. I have tried installing several versions of a sound recording program after this with the same message coming up each time. How do I fix this?

I am using Xubuntu 11.10
I think I am using the 5.0.4 version of the software center

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 659438, so it 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. Feel free to continue to report any other bugs you may find.