It was installed as 16bit? Seems that you have a laptop, so the xserver-
xorg.postinst script uses 16bit for laptops with nv because 24bit has
some issues with 16.
** Changed in: xserver-xorg-video-nv (Ubuntu)
Status: New => Incomplete
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NV 7400 shows 16 bit colour instead of 24 bit
https://bugs.launchpad.net/bugs/115595
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