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Install LXDE and LXDM
Steps to remove Ubuntu Desktop and replace with LXDE and LXDM.
sudo apt remove --purge ubuntu-desktop unity*
sudo apt install lxdm
sudo apt remove --purge gdm3
sudo apt install lxde
sudo apt install --reinstall lxdm
Credits @ https://www.zaferarican.com/post/how-to-save-1gb-memory-on-jetson-nano-by-installing-lubuntu-desktop