Thank you very much for your support !!
I was able to mount the docker image with:
docker run -it clickable/amd64-16.04-arm64:16.04.5 bash
But suddenly I realised that libqt5remoteobjects5
is not available on xenial 16.04
, nor on the xenial-backports universe
and manually installing from ports.ubuntu.com results in an error.
So I guess here is the end. I seriously have to think about switching OS after 5 years Ubports...