Read the statement by Michael Teeuw here.
Rpi 3B+, can't install
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I tried like 3 or 4 times to follow several guides. Can’t make it work, as I see errors during installation process. in short - is there anyone who can help me installing via SSH?
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I was having a ton of errors installing on a new Rpi 3B+ too. Following @NoNameRo 's suggestion on uninstalling & reinstalling node from source fixed it for me: https://forum.magicmirror.builders/topic/8431/npm-install-is-giving-error/9?page=1
What errors are you getting?
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There is a bounch of npm warn notice security, but error i get is

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Followed your advice and I got new error

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This post is deleted! - 
Personally, I would try a manual install of MM instead of the install script which seems to falter at times.
- Rename your current MagicMirror folder (so you don’t lose it)
 - Download MagicMirror from the Repo
 - Rename the new MM folder to MagicMirror
 - Run 
npm installin the new MagicMirror directory - Run 
npm startin the new MagicMirror directory 
At this point you should get an error message to create a config. That’s a good thing. It means MM is installed correctly and running. You just need a working config.
https://forum.magicmirror.builders/topic/4528/how-to-create-a-working-config-for-absolute-beginners
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Would you please type correct commands? I’m not too good with commandline.
I usedmv MagicMirror MagicMirror2 bash -c "$(curl -sL https://raw.githubusercontent.com/MichMich/MagicMirror/master/installers/raspberry.sh)"I see an error

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so I did
mv MagicMirror MagicMirror3 git clone https://github.com/MichMich/MagicMirror npm startand I see
Segmentation fault - 
Try
git clone https://github.com/MichMich/MagicMirrorthencd MagicMirrorfollowed bynpm install.
Looks to me you tried to start the MagicMirror before installing it. - 
Segmentation fault
 
