Build docker failed in apt-get

[TravisCao]

I failed to build the docker file with image name pymarl:1.0 when apt-get some package.
The error is as follows:

It said the repository is not signed. I searched on Google, it used apt-get update and etc. However, this is in a docker file and I don't know how to sovle this.

OS: macOS 10.15.5

[xnduig]

My error is same to yours, have you solved this?

[KandBM]

I replaced it with the latest version of the cuDNN docker image (nvidia/cuda:11.3.0-cudnn8-devel-ubuntu20.04 ATT) which fixed the issue. Since the dockerfile is % years old I think cuDNN version is depreciated