Ubuntu 6.06 shutting down the power supply?(was "Auto Shutdown Ubuntu 6.06 ")

[camerashy44]

I had Ubuntu 6.06 on my Optiplex GX1 working fine. On shut down it would
dismount everything and then at the end would
shut down the computer and turn off the power.
I installed the up-grades that showed up on my up-grade icon and now when I
shut down, Ubuntu dismounts everything and
when it gets to "Will now Halt" it just sits there and I have to turn off
manually.
Any ideas as to what happened and how to correct it?
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