So it seems the empty env is the problem. If I first do a conda install python in the empty env, the conda installation as suggested in the docs works just fine (conda install -c fastai -c pytorch -c anaconda fastai gh anaconda).
So it seems the empty env is the problem. If I first do a conda install python in the empty env, the conda installation as suggested in the docs works just fine (conda install -c fastai -c pytorch -c anaconda fastai gh anaconda).