In my case, installing linux-backport-modules-jaunty also solved the problem. Actually, usplash was not causing the bug but hiding the real cause : an iwl3945 (or maybe more generally iwlagn) crash.
-- Jaunty & Interpid: won't power off on shutdown or reboot https://bugs.launchpad.net/bugs/326988 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs