Comment 3 for bug 658828

I'm not sure that's a Google issue (update-alternatives has printed those messages when configuring chrome because *something* deleted /usr/bin/firefox)

My guess is it's most likely Ubuntuzilla, like the other gazillion reports we get with this issue ;)

In fact, at the bottom of the log, you can see /usr/bin/firefox still doesn't exist even after unpacking the new firefox version, which means it's been diverted away by something.

If you've used Ubuntuzilla in the past, please report your issue to them. We have a long standing problem with them breaking our official packages, and we highly discourage users from using Ubuntuzilla