How to restart the camera?

Run the camera from your Jetson Nano

sudo systemctl restart nvargus-daemon

How to change ROS distribution?

Change a ROS distribution is pretty simple, you can simply use the commands in the nanosaur script

nanosaur down
nanosaur distro galactic
nanosaur update
nanosaur wakup

if you want to return to the official distribution

nanosaur down
nanosaur distro latest
nanosaur update
nanosaur wakup