@SkewedZeppelin
After installation, it turned out that Mull does not want to go to the Internet. I had mobile data and wifi turned on. After other attempts, I used the reset options and finally reset to factory settings.
Again Mull did not want to go on the internet and I installed Brave via the computer. With that I was able to get on the internet just as I did afterwards with Mulch for testing.
Is there a solution for this, unfortunately I have not found anything.