For me, this problem developed about a week ago. Cannot recall exactly when.
Changing grub did not work.

Also, the Kubuntu Launcher buttons no longer work either.

I have shut down by using Terminal, <sudo halt>

The notebook (DELL xps m1530) then shuts down but does not actually shut
off.

Not sure if this may have something to do with the fact that I did not
know that one must use kdesudo when starting a gui process.

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https://bugs.launchpad.net/bugs/987933

Title:
  10de:0407 Ubuntu 12.04 shutdown hangs with proprietary nVidia driver

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