linux_group.add_argument('--centos', type=str, nargs='?', const='7', default=None,
help='Select Centos Linux base image.')
-parser.add_argument('--cuda', type=str, nargs='?', const='10.2', default=None,
+parser.add_argument('--cuda', type=str, nargs='?', const='11.0', default=None,
help='Select a CUDA version for a base Linux image from NVIDIA.')
parser.add_argument('--mpi', type=str, nargs='?', const='openmpi', default=None,