Need help creating a USB Installer to upgrade a Sierra system to Catalina

Hello. I need a little help. I am presently running MacOS Sierra fine together with an Ubuntu installation on this system. The main OS for the system is Ubuntu, but Sierra is installed on a secondary partition and I use an old UniBeast High Sierra Installer USB that I had created when I thought to upgrade to High Sierra to boot up the MacOS. I am trying to upgrade MacOS to Catalina. I have successfully downloaded the "Install Catalina" app. I have downloaded UniBeast and MultiBeast for...

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