Updates fail

[Dana Marsee]

When I try to update I get an error message...."Couldn't fetch the package cache information lists".
So I tried to install updates manually with terminal and got another error message...
Reading package lists... Error!
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/repo.steampowered.com_steam_dists_precise_steam_i18n_Translation-en
E: The package lists or status file could not be parsed or opened.


Is anybody else having this problem?  Can you tell me what I need to do to get updated?
Thanks..