I apologize, I'm new to Linux so please cut me some slack. I've tried all day to solve my problem on my own but every time I feel like I've finally made some progress I run into another road block. So, I have a Late 2011 model 11" Macbook Air that I have just installed Ubuntu 12.04 on via Parallels (the latest version). The native screen resolution on the 11" air is 1366x768, which is not an option for the resolution presets. I can run other resolutions for nowbut it needs to be fized eventually. So, I looked around and discovered xrandr and the newmode, addmode, etc. However, whenever I do any of this I eventually end up with the "Failed to get size of gamma for output default"

I read this article

https://wiki.ubuntu.com/X/Config/Res...s_in_xorg.conf

as well as a few others and they suggest that the monitor is not supplying xrandr with the information it needs and therefore I should maually edit the xorg.conf file. However, I had no success locating such a file and have since learned that it no longer exists in Ubuntu. Then I searched for a way to create one manually and came across this article

http://askubuntu.com/questions/7430/...gure-segfaults

which didn't help me much either. I just got

Fatal server error:
Server is already active for display 0
If this server is no longer running, remove /tmp/.X0-lock
and start again.

So, my question is what now? All I want to do is set up a resolution of 1366x768!

Any help would be greatly appreciated.

Turns out I didn't have Parallels Tools installed.....

By default, X tries to use screen 0 when running the configure command, but screen 0 is already in use by the currently running X session, hence the error. To create the xorg.conf file when you're already running X, try:This will cause X to use screen 1 for the configuration process. I edit the newly-created xorg.conf.new file as needed, then copy it to /etc/X11/xorg.conf and restart X.