Connect to an existing X11 session over VNC without X11VNC on Debian

vnc-to-existing-x11-session.md

Install tigervnc-scraping-server

sudo apt-get install tigervnc-scraping-server

Add a password to the VNC server

vncpasswd

Edit the xstartup file to work on Gnome

nano $HOME/.vnc/xstartup

Put the contents of the xstartup file I attached, after that, you need to make it executable

chmod +x $HOME/.vnc/xstartup

Setup service for the VNC server

mkdir -p $HOME/.local/share/systemd/user
nano $HOME/.local/share/systemd/user/vncserver@.service

Put there the contents of the file I attached, remember to change [YOUR_USER] to your actual account username

Start the service and enable it on boot

systemctl daemon-reload --user
systemctl start vncserver@0 --user
systemctl enable vncserver@0 --user

vncserver@.service

[Unit]
Description=TigerVNC Service

[Service]
Type=forking
ExecStartPre=-/usr/bin/x0vncserver -kill :%i > /dev/null 2>&1
ExecStart=/usr/bin/x0vncserver -passwordfile /home/[YOUR_USER]/.vnc/passwd -display :%i -localhost no
ExecStop=/usr/bin/x0vncserver -kill :%i

[Install]
WantedBy=default.target

xstartup

#!/bin/bash

unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS

/usr/bin/gnome-session