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How to triple boot Catalina 10.15.7, Windows 10 and Ubuntu 20.10 : update Solved

For people who would like to use a triple boot machine : Catalina, Windows 10 and Linux Ubuntu, and who already have Catalina and Windows 10 installed, then you came to the right place. As far as I am concern, my triple boot is now fully working. I basically did not create the dummy partition David Anderson suggest in the procedure below. I instead fixed Windows after Linux was installed by using the gdisk command from the terminal in the recovery partition. I was also able to get Refind going again by running the install into Catalina terminal. You can follow David's procedure down below. It is probably safer than mine. Thanks to him for putting this procedure together.

Have a good one.