cannot install or remove programs in Ubuntu 10.10

[Jason]

When attempting to install or remove a program in the Ubuntu software center, I am told there is a programming error in aptdaemon, and am directed to this site and then asked to try again.

[Luc van Horen (lucvanhoren)]

Details:

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 779, in simulate
    return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 958, in _simulate_helper
    return depends, status, self._cache.required_download, \
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 218, in required_download
    pm.get_archives(fetcher, self._list, self._records)
SystemError: E:I wasn't able to locate file for the ttf-mscorefonts-installer package. This might mean you need to manually fix this package.

[cuzzo (cuzzotto)]

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 779, in simulate
    return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 861, in _simulate_helper
    self._cache)
  File "/usr/lib/python2.6/dist-packages/apt/debfile.py", line 57, in __init__
    self.open(filename)
  File "/usr/lib/python2.6/dist-packages/apt/debfile.py", line 66, in open
    self._debfile = apt_inst.DebFile(open(self.filename))
IOError: [Errno 2] No such file or directory: '/tmp/radiotray_0.6.4_all.deb'

[Vishnu Guddanti (rahulchelsea999)]

traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 768, in simulate
    return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 936, in _simulate_helper
    return depends, status, self._cache.required_download, \
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 218, in required_download
    pm.get_archives(fetcher, self._list, self._records)
SystemError: E:I wasn't able to locate file for the ttf-mscorefonts-installer package. This might mean you need to manually fix this package.