There is an error in the documentation for rebooting a Virtual Dedicated Linux server the help text says this:

1. SSH to your server.
2. In the command line, type:
   su-
reboot

This will just get bash to give you a rude message. Instead do this:

1. SSH to your server.
2. In the command line, type:
   su -
reboot

We are currently working to get corrections made.