a

ERROR: Unable to load the kernel module 'nvidia.o'.  This happens most
       frequently when this kernel module was built against the wrong or
       improperly configured kernel sources, with a version of gcc that differs
       from the one used to build the target kernel, or if a driver such as
       rivafb/nvidiafb is present and prevents the NVIDIA kernel module from
       obtaining ownership of the NVIDIA graphics device(s).