X11VNC

sudo apt update
sudo apt install lightdm
sudo init 6

sudo apt install x11vnc
sudo mkdir -p /etc/x11vnc/x11pass
sudo x11vnc -storepasswd /etc/x11vnc/x11pass/${USER}
sudo cat /etc/x11vnc/x11pass/${USER}

sudo tee /lib/systemd/system/x11vnc.service >/dev/null <<'EOF'
[Unit]
Description=x11vnc service
After=display-manager.service network.target syslog.target

[Service]
Type=simple
ExecStart=/usr/bin/x11vnc -forever -display :0 -auth guess -passwd my-password
ExecStop=/usr/bin/killall x11vnc
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

Playground

cat /etc/X11/default-display-manager
sudo dpkg-reconfigure lightdm
sudo dpkg-reconfigure gdm3
ls -lah /etc/lightdm/
ls -lah /etc/gdm3/

References

X11vnc » LightDM » Change Display Manager Linux Virtual Display for iPad Pro
USB4 » Thunderbolt » iPad Pro iPad Pro » Specification VS Code on iPad Pro Apple iPad Pro Thunderbolt