For the last several months on my Ubuntu machine at work the numpad has not been working. It has been so frustrating. I would turn the numlock on and off and nothing would seem to get it to work.
I thought it was something wrong with the keyboard or possibly after a kernel update one of [...]

I had installed Adobe Reader to replace the default eVince document viewer. The problem was that PDFs I opened in Nautilus still opened with eVince. I wanted to know how to fix it so it would always open with Adobe Reader.
In order to do that you need to navigate to the file you want to [...]