Since installing the Limewire deb on my Kubuntu 7.04 system I cannot upgrade Firefox.

When I try I get the following error:
E: /var/cache/apt/archives/firefox_2.0.0.5+1-0ubuntu1_i386.deb: trying to overwrite `/usr/lib/firefox/defaults', which is also in package limewire-basic

How do I work around this?