For anyone interested:
Got monailabel install and server working in Windows 10 WSL Ubuntu by
git clone https://github.com/Project-MONAI/MONAILabel
pip install -r MONAILabel/requirements.txt
export PATH=$PATH:`pwd`/MONAILabel/monailabel/scripts
then
# download radiology app and sample dataset
monailabel apps --download --name radiology --output apps
monailabel datasets --download --name Task09_Spleen --output datasets
and then starting the monailabel server by
# start server using radiology app with deepedit model enabled
monailabel start_server --app apps/radiology --studies datasets/Task09_Spleen/imagesTr --conf models deepedit
The pip install monailabel
process did not succeed, although it would probably be the better solution for new monailabel users.