@chartonjeremiah : this did not work for me. But just now, I happened to find this posting: [Install the image of Ubuntu MATE 20.04 but not Ubuntu MATE Welcome and Software Boutique] [Install the image of Ubuntu MATE 20.04 but not Ubuntu MATE Welcome and Software Boutique] suggesting to install the Welcome application again by using "sudo snap install ubuntu-mate-welcome --classic" in de terminal window and that was the solution. Now indeed I Welcome under Administration and in the Control Centre. Thanks for your help anyway!
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