This is fixed in archive.ubuntu.com already. It was a transient issue because gksu took a bit to biuld on amd64. The other mirrors should catch up soon.
Cheers, Michael ** Changed in: gksu (Ubuntu) Status: Confirmed => Fix Released -- upgrade path broken due to missing gksu version https://launchpad.net/bugs/90433 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs