Trouble installing Eclipse through the Software Manager

[Milton Reuben Rodrigues]

1) I Interrupted eclipse installation because it was not showing any response for about an hour.
2) While trying to re-install it through the software center, I get an error with the following report.

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 x11proto-core-dev package. This might mean you need to manually fix this package.

P.S. I am relatively new to Linux (but am moderately comfortable with shell commands, need to brush up my basics )

Regards
Ben