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Problem:
When opening KiCAD on Linux, you see the error message Unable to add inotify watch: (error 28: No space left on device)
:
Solution:
You need to increase the number of inotify watches that can be active at once:
echo fs.inotify.max_user_watches=65536 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
and then restart KiCAD