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I'm running CentOS 6.3 x64 in CLI. When I try to install guest additions, everything seems to work. Except "Installing the window system drivers" returns "[FAILED[ (Could not find the X.Org or XFree86 Window System" which I assume is because it's a CLI and doesn't have a window system.
After restarting, the guest additions do not seems to be installed, as the window will not resize.
I have tried a yum update and a yum upgrade but, to no avail.

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the guest addition auto-resize only works on a XWindow system, it won't work if you only have CLI. To change size of CLI, you should edit your kernel parameters in grub config. – David Dai Dec 7 '12 at 2:03
Ah. I see. Thank you. – Chris Powell Dec 9 '12 at 15:06

This is a simple fix, first install dependent drivers:

yum -y install xorg-x11-drivers xorg-x11-utils

and re-run the guest additions script

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