Read the statement by Michael Teeuw here.
Electron Install Error - Electron not found
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 Hi! Just did a MM-upgrade and after that I have problems to get MM started. I attach the error messages. Thanks !!  
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 @CLLA1972 I don’t know make a backup see my https://github.com/sdetweil/MagicMirror-backup-restore then rename the MagicMirror folder out of the way, and run my install script. see if we can get running 
 see
 https://github.com/sdetweil/MagicMirror_scriptsif so, then run the restore to put back all the modules and config in the new mm folder created by install 
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 @CLLA1972 yes, looks like another fun npm install problem do cd ~/MagicMirror sudo rm -rf node_modules rm package-lock.json npm install --omit=dev
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 @sdetweil Thanks so much for the support. Still not “there yet”. I got the following error message.  Again, THANKS !!! 
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 @sdetweil Hi. I am using a PI3B+ /Thanks. 
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 ok, troublesome cd ~/MagicMirror rm -rf node_modules/electron npm install electron@19.0.15
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 @sdetweil Here the result.  
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 @CLLA1972 
 show output of node -vrun my upgrade script with force instead of apply (as u are on the latest release) bash -c "$(curl -sL https://raw.githubusercontent.com/sdetweil/MagicMirror_scripts/master/upgrade-script.sh)" force
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 @CLLA1972 ok, I don’t get what is going on, but cd ~/MagicMirror rm -rf node_modules/env-paths npm install electron@19.0.15

