Comment 2 for bug 600271

The error is:

update-alternatives: error: alternative path /usr/bin/firefox doesn't exist.
dpkg: error processing firefox (--configure):
 subprocess installed post-installation script returned error exit status 2

This symlink exists in our package. The only way it would not exist is if a third party package has set up a divert, and there's not a lot we can do about that. Have you installed packages from ubuntuzilla (or followed instructions from there?). If so, you need to report this issue to them