Maybe more of a JupyterLab issue but could be interesting for you to know.
I have set up on a DigitalOcean droplet. I can open JupyterLab and create a new notebook.
However the Icon next to the "python 3" text in the upper right is grey instead of green and if I try to run a command in a cell the "*" comes up next to the cell and stays there while no output is shown.
Restarting the kernel does not do anything.
I switched to Google Chrome as my browser and now it works.