VNC on Ubuntu 20.04

sudo apt install xfce4 xfce4-goodies

sudo apt install tigervnc-standalone-server

As the target user, set the VNC password

vncpasswd

cat << EOF >> ~/.vnc/xstartup
#!/bin/bash
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
vncconfig -iconic &
dbus-launch --exit-with-session startxfce4 &
EOF

chmod +x ~/.vnc/xstartup

vncserver -localhost no

vncserver -list

vncserver -kill :1