problem in installing/removing packages in my ubuntu 10.10

[Akshath Shankar Bhat]

i am unable to install/remove any packages in ubuntu
 software center, I get a message :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 sun-java6-jre package. This might mean you need to manually fix this package.