Your NVIDIA driver might be too old (450.51.06) to use the CUDA11.1 runtime.
Table 1 in this doc 1 gives:
CUDA Toolkit	Linux x86_64 Driver Version
CUDA 11.2	>= 450.80.02
CUDA 11.1 (11.1.0)	>= 450.80.02
CUDA 11.0 (11.0.3)	>= 450.36.06

You could try to install the CUDA10.2 binaries or update the driver.