So I was looking at a question about forcing X to recognise video memory to achieve 1080p resolution, however when I finished the following piece of code:Section Device        Identifier Screen0        VideoRam 1048576EndSectionI don't know what to do. I tried to exit and save it but it told me File and location does not exist or something like that. What do I do? How do I save it? Here is the post I was looking at for answers.Achieving full resolution with PowerVR SGX454 on Ubuntu 12.04
Forcing X to recognise video ram, saving the file 99-vesa file
ubuntu;xorg;resolution