The python version checker showed no version for Cudnn here (N/A). Will see if this resolves the missing symbol problem here. Is Cudnn supposed to be installed by the dependency script?
Edit: Installing CuDNN did not help. I see some other posts saying that Cuda 10 is required, and Cuda 10.1 and 10.2 may not work. I had 10.2 here.
For Ubuntu, install Cuda-10-0.