I am trying to correct my boot up to black screen but don't know how to get to the command prompt. Environment is Ubuntu server 12.04
Here is a line of code that was given to me in an answer.
pkexec gedit /etc/default/grub
Sorry I'm so lame but at least I was able to stand up my server to black screen. My NETGEAR Genie shows my box on the network map. Not too bad for a beginner I spose. Thanks for all your help folks.