@sean
Your comment about multiple executions of mm got me thinking.
before the update i started the mirror. “pm2” didn’t worked and the mirror was shutdown, through ctrl+c.
So i did a restart of the pi and… now it works :-D
So the sollution (for me in this case) was restarting the pi, so it forgets the instance of mm :-D
@sean
thx for the link. I tried something like this. But this is much harder and there were a lot of possible mistakes I could make. I think it is easyer to reinstall a new raspian an the magicmirror. I had never thougt, that there is no easy way to move to a bigger sd card, but it seems to be this way.
speciall thx my dear. I have reached the problem in another way. I wrote this command into the rc.local:
su pi -c ‘/home/pi/mm.sh &’
And now I have the MM after reboot. I am so happy :)