[ec2] Cannot reboot instances

[Darren Govoni]

Hi,
  I'm having trouble getting my instances to reboot either from the EC2
service call or from Amazon Management Console. The service call returns
successfully and the console indicates reboot, but when I refresh the
server list, its back to running. It never reboots.

Is this a function of the Ubuntu image or perhaps something wrong
elsewhere in EC2?

thanks,
Darren