Using package manager, you may encounter error messages:
Error: Encountered a section with no Package : header,
Error: Problem with MergList /var/lib/apt/lists …
Error: The package lists or status file could not be parsed or opened.
Here is a possible fix:
Open Terminal and type these commands:
sudo rm /var/lib/apt/lists/* -vf (enter) (enter your pwd when prompted)
sudo apt-get update (enter)
This should delete the old entries and download the latest ones, clearing the errors.
Thanks to admin at http://ihaveapc.com/2011/05/how-to-fix-problem-with-mergelist-varlibaptlists-error-in-ubuntu-11-04/ for publishing the article entitled
How To Fix “Problem with MergeList /var/lib/apt/lists” Error In Ubuntu 11.04 which was published May 01, 2011. There are currently 60 comments appended to that article.