Bad luck, the kernel headers for the target kernel version could            
not be found and you                                               
did not specify other valid kernel headers to use.     


If the running kernel has been shipped with the Debian           
distribution, please install the package                                   
linux-headers-2.6.18-4-amd64. If your kernel source tree (or                
headers) is located in some non-usual location, please set the              
KERNELDIRS environment variable to the path of this directory, or            
(alternatively) specify the source directory we build for with               
the --kernel-dir option in module-assistant calls.     


ackage nvidia-kernel-source was not built successfully, see                 
 /var/cache/modass/nvidia-kernel-source*buildlog* for details!