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!