Running xubuntu 18.04
FATAL: modpost: GPL-incompatible module nvidia.ko uses GPL-only symbol ‘__put_devmap_managed_page’
scripts/Makefile.modpost:92: recipe for target ‘__modpost’ failed
make[2]: *** [__modpost] Error 1
Makefile:1503: recipe for target ‘modules’ failed
make[1]: *** [modules] Error 2
make[1]: Leaving directory ‘/usr/src/linux-headers-4.18.0-041800rc5-generic’
Makefile:79: recipe for target ‘modules’ failed
make: *** [modules] Error 2