On stock Raspbian, to change the IP address of the ethernet connection, you would right-click on the network icon at the top-right of the screen, and select "Wired and Wireless Network Settings", then it's easy to change the IP address of eth0.

On StellarMate, I think (but not sure) that they use a different network manager than Raspbian. I think StellarMate uses gnome network manager, so the button clicks/menu entries might be different, but the idea is the same.

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