Способ 1:
1. aptitude install nvidia-glx nvidia-kernel-`uname -r` nvidia-kernel-dkms nvidia-settings nvidia-xconfig 2. nvidia-xconfig
Способ 2:
aptitude purge nvidia-kernel-common nvidia-kernel-dkms nvidia-kernel-source
какая версия debian?
Я всегда ставил так:
apt-get install module-assistant nvidia-kernel-common
m-a auto-install nvidia-kernel${VERSION}-source
apt-get install nvidia-kernel-source nvidia-kernel-common
apt-get install linux-headers-$KVERS
apt-get install nvidia-glx${VERSION}
apt-get install nvidia-xconfig
cp -p /etc/X11/xorg.conf /etc/X11/xorg.conf.bak
nvidia-xconfig
reboot