deb:#npm -g install ./Joplin-2.6.10.AppImage
npm ERR! code ENOTDIR
npm ERR! syscall open
npm ERR! path /home/simon/zaloopa/new/Joplin-2.6.10.AppImage/package.json
npm ERR! errno -20
npm ERR! ENOTDIR: not a directory, open '/home/simon/zaloopa/new/Joplin-2.6.10.AppImage/package.json'
npm ERR! A complete log of this run can be found in:
npm ERR! /home/simon/.npm/_logs/2022-01-26T10_37_18_401Z-debug-0.log
Trying to run as before ./Joplin.App
It doesn't work, it asks for an application to open the file
And then I read this and tried https://imgur.com/ZRIE737.png
Thank you
That instruction is for the terminal app only, it won't work for the appimage as it isn't a node package.
You should just be able to run an appimage natively on your OS.