Issue:
Upgrade of NVIDIA version from 177.* to 180.* causing X to fail
Cause:
nvidia.ko still symlinked to older kernel
Solution:
1) init 3
2) Upgrade to NVIDIA 180.* driver (execute NVIDIA*.run)
3) rm /lib/modules/*kernel version*/weak-updates/updates/nvidia.ko
4) ln -s /lib/modules/*kernel version*/kernel/drivers/video/nvidia.ko /lib/modules/*kernel version*/weak-updates/updates/nvidia.ko
5) init 5
