Read the statement by Michael Teeuw here.
MM doesnt work after update to version 2.26
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 not running headless. Just don’t have a keyboard attached to pi. so SSH intomachine. 
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 @davismorehead I use ssh exclusively, so that’s not it. and you are running in graphical mode, w the desktop…right? I’ve had that check in there for 3 years now… and I just checked on all my pi systems. it never fails to find the file… 
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 i checked i don’t have that file. looking on internet it says During the booting up of the system, systemd activates default. target , which is generally a symbolic link in the /etc/systemd/system/ directory to either graphical. target or multi-user. target . It is equivalent to the default runlevel, which the system administrator used to set in the /etc/inittab file. I don’t have graphical.target or multi-user.target but I have graphical.target.wants 
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 @davismorehead weird 
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 so should i try and get your script to work or do something else to fix this 
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 @davismorehead you could try upgrade, with force instead of apply. 
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 how do I do that? also if I run the command 
 pi@raspberrypi:~ $ systemctl get-default
 graphical.targetI get graphical even though I don’t have the file 
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 I did npm update. i did pm2 start mm and it works. Thank you very much 
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 @davismorehead what npm update? 
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 I will look at your script later. So in the future I should run npm update not npm install? 
