Update to CUDA 10.1

ubuntu/Dockerfile

 # SPDX-License-Identifier: Apache-2.0
 
 ARG UBUNTU_VERSION=18.04
-ARG CUDA=10.0
+ARG CUDA=10.1
 FROM nvidia/cudagl:${CUDA}-base-ubuntu${UBUNTU_VERSION}
 
 LABEL maintainer="Moritz Maxeiner <moritz.maxeiner@fu-berlin.de>"