There are times when you try to update cPanel from the UI and it will fail or will hang. When this happens, you are able to force the update from the comamnd line. SSH into the server as root, then run the following command.
This will show you what is going on will normally fix any update issues that you were having, but will also help you to troubleshoot any problem that may come up with the update.
Chris January 21st, 2011