Please refer to the Section Usage of the post My Docker Images for detailed instruction on how to use the Docker image. docker run -d \ --name lubuntu-pyside2 \ --log-opt max-size=50m \ -p 4000:4000 \ ...

Check whether by chance fix to #86 helps (I doubt it). Then try to find out whether it's really that the dll can't be found and that this is really not a dll load of an actually existing file that ...