welcome to the forum @1onkar
I suggest using the install method recommended in the node-red docs, for Debian/Ubuntu/Raspbian systems, and already suggested earlier in this thread - Running on Raspberry Pi : Node-RED
Then all you have to do to autostart on boot is to run
sudo systemctl enable nodered
You should just be able to run the script in that link and it should sort everything out. Provided you have not install n or nvm
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