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Issue description: feedback from learner david.horwath@arbetsformedlingen.se   :

"

Your really need to make the JupiterLab work on a linux. Rendering is not really working.

The JupiterLab saves so much work (if working). This because you can copy-paste, handle files etc...

Having a linux course that isn't compatible with all browsers and operating systems... well... don't need further explanation.

I saw in jupyter forums that a feature request has been made for this.
Basically the feature request is about letting the user choose between WebGL/canvas/HTML/auto, instead of it being automatic.

If you are unlucky (like me) the Linux Mint version, Firefox, and graphic driver is making text render "invisible", hence making the jupyter terminals worthless. "

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