UBUNTU 9.04 won't shut down

[mugwump40]

When I click to shut down UBUNTU 9.04, it does a normal shut down but stops with the kill signal and does not power off. I press the off switch on the PC and it immediately shuts down. Here is a part of the sys log:

Apr 27 18:09:03 Fuzzbutt syslogd 1.5.0#5ubuntu3: restart.
Apr 27 18:37:36 Fuzzbutt -- MARK --
Apr 27 18:57:36 Fuzzbutt -- MARK --
Apr 27 19:17:37 Fuzzbutt -- MARK --
Apr 27 19:37:37 Fuzzbutt -- MARK --
Apr 27 19:57:37 Fuzzbutt -- MARK --
Apr 27 20:17:37 Fuzzbutt -- MARK --
Apr 27 20:37:37 Fuzzbutt -- MARK --
Apr 27 20:57:37 Fuzzbutt -- MARK --
Apr 27 21:10:03 Fuzzbutt kernel: [12759.530549] NVRM: failed to unregister from the ACPI subsystem!
Apr 27 21:10:07 Fuzzbutt exiting on signal 15

[Fabio Marconi (fabiomarconi)]

Thank you for taking the time to report this bug and helping to make Ubuntu better.
Is this bug reproducible with the latest Lucid packages ?
Thanks in advance.

[Fabio Marconi (fabiomarconi)]

 Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at https://wiki.ubuntu.com/Bugs/FindRightPackage .

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://help.ubuntu.com/community/ReportingBugs.

[Fabio Marconi (fabiomarconi)]

We'd like to figure out what's causing this bug for you, but we haven't heard back from you in a while. Could you please provide the requested information? Thanks!

[Fabio Marconi (fabiomarconi)]

We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New". Thanks again!