not able to create xorg.conf file

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http://unix.stackexchange.com – I want to change my colour depth. I posted this, and got the following answer: Create an xorg.conf file by running Xorg -configure. Then edit the Depth entry in the Display subsection of the Screen section. You can start an X server with a non-default depth by running e.g. startx -- -depth 8. So I run sudo Xorg -configure, but I get this error: Fatal server error: Server is already active for display 0 If this server is no longer running, remove /temp/.X0-lock and start again. So I run sudo rm -rf /temp/.X0-lock. And then I run sudo Xorg -configure, but get this: (HowTos)