Thank you very much for you reply (and sorry for the belated response).
I followed your instructions and rebooted my machine and was greeted with a black screen. I nearly went apoplectic because I thought I completely bricked my computer. Fortunately I was able to find a fix here and everything is back to normal.
I guess the lesson I learned here is that trying to use Linux with an NVIDIA GPU is a terrible idea. I’ll just live with this issue from now on until I can get an APU or a Radeon GPU if that makes a difference. Thanks for the help though.