Not that I know of. If there are issues because some ubuntu component has instituted stricter rules we are likely to fix them. Since release 2.13 is about
to become the official release you might like to have them install that. It's already up on github and we're testing it. You can always back off to 2.12 if there are issues with 2.13
Preliminary release docs at: http://webwork.maa.org/wiki/Release_notes_for_WeBWorK_2.13