Thanks @manics
Enabling debug didn’t show useful information in this regard.
On the other hand, I found the following relevant issue:
Until a better solution is found the following worked for me:
hub:
extraConfig:
logoConfig: |
import urllib.request
urllib.request.urlretrieve(“URL”, “mylogo.png”)
c.JupyterHub.logo_file = ‘/srv/jupyterhub/mylogo.png’
Many thanks for your help!