Non hai installato il Kernel-Header . Se usi Debian devi cercare ed installare il pacchetto kernel-headers-2.******* che corrisponde al kernel che hai installato. Dopo aver installato kernel-headers lo troverai in /usr/src.ERROR: Unable to find the kernel source tree for thecurrently running kernel. Please make sure you have installed the kernelsource files for your kernel; on Red Hat Linux systems, for example, be sure you have the 'kernel-source' rpm installed. If you know the correct kernel source files are installed, you may specify the kernel source path with the '--kernel-source-path' commandline option. ERROR: Installation has failed. Please see the file'/var/log/nvidia-installer.log' for details.
Per usare la tua scheda video devi scaricare da ftp://download.nvidia.comil driver giusto che non è necessariamente l'ultima versione disponibile. Io ho installato la scheda (# lspci)
0000:01:00.0 VGA compatible controller: nVidia Corporation NV5M64 [RIVA TNT2 Model 64/Model 64 Pro] (rev 15) che funziona con il driver NVIDIA-Linux-x86-1.0-6111-pkg1.run