Note; this log was generated on a Pi4 4Gb running from a SSD. However, I also test on a Pi3 Model B+ and a Pi3 Model A.
For support please go to the MakerForums at: https://forum.makerforums.info/c/laserweb-cncweb/
These Instructions should work for all Pi 3 and 4 models running the Buster and Bullseye releases. Also see the wiki page about Pi installation for more info and notes on how to run LaserWeb4 as a service.
This is nice and easy; node 12 is part of the RPI OS release.