Uh oh! It appears I've screwed up the display settings for my current installation. I just bought this new graphics card for a monitor I'll be getting soon, but in trying to get the resolution corrected in my Ubuntu installation, I've done something wrong and am no longer able to get into the desktop environment. The command I used were an amalgamation of the following AskUbuntu links: This most recent one as well as, previously, this one.
So my rig is a desktop with an Intel cpu and a new MSI Radeon on a Samsung Evo with Ubuntu 15.04 recently installed. After installing the card I logged over to my Ubuntu installation to find that the resolution was completely off. I used those mentioned links to try and solve the problem but am now unable to continue using Ubuntu with a graphical interface and have to do everything on the command line.
Pending a solution to the current video card, what is a good way to get back to the previously working state that I was in?