Read the statement by Michael Teeuw here.
Problems after Update
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 @dotmatrix812 said in Problems after Update: electron exited with signal SIGTERM Out of interest, are you using MMM-WatchDog? To me it seems like it might be a long running process that could be crashing the UI. Are there any errors in the Dev Console? shift_ctrl+iand select the Console tab and look for any errors. If you are using MMM-WatchDog, what is the value set to?
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 @mumblebaj 
 I don’t have a keyboard connected to the MM…But is it correct. I connect a keyboard to the MM and while it shows me the UI I open the DEV Console and check there for errors ? I don’t use MMM-Watchdog. Thanks for your assistance 
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 @dotmatrix812 said in Problems after Update: But is it correct. I connect a keyboard to the MM and while it shows me the UI I open the DEV Console and check there for errors ? That is correct. You could also VNC into the mirror and do the same action from the machine you use to VNC into the mirror. 
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 because it fails on the sample config. try this cd ~/MagicMirror rm -rf node_modules npm installand then try again w the sample config. how old is that sd card 
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 I tried this, but same problem with sample config. SD-Card is in there fro the beginning, at max one year… Will try a new one, but have to get one first ;-) Maybe this is the solution. Thanks, I will come back to you. If it’s not the SD I will try to connect the keyboard and check the DEV Console for errors. 

