How can I connect Jupyter with SageMath kernel?

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Do you mean that you want to connect a systemwide-installed Jupyter to Sage's kernel ?

If so, this is documented here.

The first method should be usable with a procompiled Debian.Ubuntu (set of) package(s). Since I maintain my Sage installation from the souce git tree, I use (and recommend) the alternative symlinking method.

HTH,

You must have the Ubuntu package sagemath-jupyter installed on your system. Then you should launch Jupyter from the SageMath environment by typing the command sage -n in a terminal. It should open Jupyter in your browser and you should be able to select the SageMath kernel in it.

PS: if you would like to run a version of SageMath more recent than 9.5 (in particular 10.2, the last stable version) , take a look at https://sagemanifolds.obspm.fr/instal...

Update: see @Emmanuel Charpentier's answer for running the SageMath kernel in a system-wide Jupyter.