There seems to be a programming error in aptdaemon, software that lets you install / remove programs and to implement other measures related to package management.

[Patrik Nygren]

I was installing a program called "Wine" when it suddenly stoped installing.

[lemaire (francois-lemaire1)]

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 libfltk1.1 package. This might mean you need to manually fix this package.