I have an older Dell Optiplex GX620. It has an IDE CD drive and an IDE DVD drive. I cannot seem to get Ubuntu 14.04 to allow movies to play. I've tried installing libdvdcss2 as well as the libdvdread4. VLC was installed last, but each time I attempt to play a movie, the player flashed briefly, then goes back to the initial screen like I didn't even have a DVD in the drive. I'm fairly new to the linux world, so any/all suggestions would be helpful.