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. Please report this error at http://launchpad.net/aptdaemon/+filebug and retry.

[Ashu]

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 769, in simulate
    return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 833, in _simulate_helper
    self._cache.open()
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 130, in open
    self._list.read_main_list()
SystemError: E:Type 'nchpad.net/ubuntu-wine/ppa/ubuntu' is not known on line 2 in source list /etc/apt/sources.list.d/ubuntu-wine-ppa-maverick.list

[Sebastian Heinlein (glatzor)]

You made a copy and paste error. Delete /etc/apt/sources.list.d/ubuntu-wine-ppa-maverick.list

Nowadays we raise a better error.