Had the same "not shutting down" problem, fan continued to run. I removed the graphics driver $ sudo apt-get purge nvidia* Then installed the non-experimental one in "additional drivers" through the software center. No problems since.
AMD FX(tm)-4100 Quad-Core Processor × 4 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 8400 GS] (rev a2) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/987220 Title: System does not power off reliably when "Shut Down" chosen from GUI To manage notifications about this bug go to: https://bugs.launchpad.net/indicator-session/+bug/987220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
