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!