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48 minutes ago
When you open the normal display options in Ubuntu the choice to rotate your display in landscape or portrait mode is disabled if you are using proprietary NVIDIA drivers.
gksu gedit /etc/X11/xorg.conf
Section "Device"Identifier "Device0"Driver "nvidia"VendorName "NVIDIA Corporation"BoardName "GeForce 8800 GTS"Option "RandRRotation" "true"EndSection
xrandr -o left
xrandr -o normal