Ubuntu 18.04 Quadro P2000 "NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver"

There’s a problem with your compiler

module: x86/modules: Skipping invalid relocation target, existing value is nonzero for type 1, loc 00000000c0f0aa22, val ffffffffc1a5eb50

Did you set it to llvm/clang? It needs to be set to the system compiler (gcc 7.3.0). Afterwards, purge and reinstall the driver.