Comment 13 for bug 574287

ola:
Please do not assign yourself to the bug unless you are working on it, thanks.

eMcE:
Yes, that might work in some cases.
It would be advisable though, to first do the grepping and then review the result before trying to reinstall everything from it, I have a feeling things could go even worse if one is not being careful there...

Also worth noting is that any automatically-installed states will have been lost, so that's something to keep in mind as well...