upgraded kernel to 2.6.38-9-generic #43pre201105250907 and found that shutdown/reboot and halt work from the command line and also from the menu options.
pcanham@flippy:~$ uname -a
Linux flippy 2.6.38-9-generic #43pre201105250907-Ubuntu SMP Wed May 25 10:21:18 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
upgraded kernel to 2.6.38-9-generic #43pre201105250907 and found that shutdown/reboot and halt work from the command line and also from the menu options.
pcanham@flippy:~$ uname -a 907-Ubuntu SMP Wed May 25 10:21:18 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
Linux flippy 2.6.38-9-generic #43pre201105250