Hi Nabla,
could you use an online translator to translate your post to the English version please, so that other users could help you? 
From Google translate:

Hello,
From /usr/lib/aarch64-linux-gnu/ plus CUDA and CUDNN, you can see that you did not use a standard x86_64 architecture computer to compile, you are likely to use NVIDIA Jetson TX2? source code to compile (Definitely not done with hardware virtualization technology such as KVM, hardware virtualization technology cannot reach the level of virtual designated graphics card)
The reason mentioned by the person above is that there is no problem. There is indeed a cpp file that cannot be found, but the solution is definitely not to download the official libtorch (the official libtorch is compiled by the x86_64 architecture compilation system…)
So,… if you are not in a hurry, a very simple way is to remove CUDNN and just compile with CUDA. (If I remember correctly, CUDNN does not seem to be required? Is it optional?)
If only the content of CUDA is correct… (at least there is a CUDA as a basis) It is not too late to look at it. (I only know the specific details)