apt-get won't update

[LfxqtmzGT4iK]

This is the error I get when I try to update it:

E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/au.archive.ubuntu.com_ubuntu_dists_natty_main_bina ry-i386_Packages
E: The package lists or status file could not be parsed or opened.

Please help!

[mörgæs]

There are many threads on this, for example
http://ubuntuforums.org/showthread.php?t=1753585