How do I install vnc on a headless ubuntu 20.10?

Question

I am trying to install vnc on an x86_64 ubuntu 20.10 which is headless. I do NOT want Xfce, all of the tutorials for some inexplicable reason tell you to install xfce. I do NOT want to install this package as I already have the desktop manager: Gnome (default on Ubuntu).

As far as I can tell the guide on digital ocean seems to be the best except their xstartup is for xfce. I tried following and replaced xfce with gnome-session but I just get a grey screen and can't interact with anything.

could anyone please help me with this or point me in the right direction.

Thanks!

Edit: Here is my xstartup:

# Config requires following packages:
# gnome-panel nautilus gnome-terminal metacity
#
export XKL_XMODMAP_DISABLE=1
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
gnome-session &
gnome-panel &
metacity &
gnome-terminal &

I run vncserver via ssh on a remote machine using this:

$ vncserver
New 'X' desktop is media-server:1
Starting applications specified in /home/kevin/.vnc/xstartup
Log file is /home/kevin/.vnc/media-server:1.log

and here is the log:

04/02/21 10:40:28 Xvnc version TightVNC-1.3.10
04/02/21 10:40:28 Copyright (C) 2000-2009 TightVNC Group
04/02/21 10:40:28 Copyright (C) 1999 AT&T Laboratories Cambridge
04/02/21 10:40:28 All Rights Reserved.
04/02/21 10:40:28 See http://www.tightvnc.com/ for information on TightVNC
04/02/21 10:40:28 Desktop name 'X' (media-server:1)
04/02/21 10:40:28 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t
04/02/21 10:40:28 Listening for VNC connections on TCP port 5901
Font directory '/usr/share/fonts/X11/75dpi/' not found - ignoring
Font directory '/usr/share/fonts/X11/100dpi/' not found - ignoring
(gnome-panel:123980): gnome-panel-WARNING **: 10:40:30.098: Failed to acquire bus name!
metacity-Message: 10:40:30.227: could not find XKB extension.
(metacity:123981): metacity-WARNING **: 10:40:30.232: Failed to create compositor: Missing composite extension required for compositing
Xlib:  extension "X-Resource" missing on display ":1".

Here is what I get when I try to view the desktop:

Please [edit] your question to include the contents of your xstartup file - and also any relevant errors from the session log — steeldriver, Feb 04 '21 at 14:14
@steeldriver Thank you, I have posted the xstartup and the logs when I start it. — Kevin, Feb 04 '21 at 15:46
Sorry it's been a while since I played with any of this stuff - however I think you will be out of luck running metacity with the current (gnome3 based) session. It used to be possible to specify a gnome2 based "flashback" session via the --session= option but I'm not sure if that's possible any more (or, if it is, how). — steeldriver, Feb 04 '21 at 16:35
So it looks like there is a gnome-session-flashback package for groovy. This walkthrough (for focal) may be helpful as well How to Install Classic GNOME Flashback in Ubuntu 20.04 LTS — steeldriver, Feb 04 '21 at 22:24
@steeldriver Thank you again. Just paste this in an answer and I will mark it as accepted. — Kevin, Feb 05 '21 at 13:49
Please consider writing your own answer instead, including the working .xstartup file - I'm sure it will help others. — steeldriver, Feb 06 '21 at 14:55
you need to install xorg-dummy to create a display for vnc to export — JOHN GROSS, Apr 11 '22 at 01:58

score 6 · Accepted Answer · answered Sep 08 '22 at 12:00

Of course this is possible! There is nothing magical, Virtual display, desktop manager and VNC server are 3 pieces that must be put together correctly.

VNC server setup consists of 3 main steps:

Xvfb - starting virtual display (can be used not only by GUI desktop, but could run apps like games or chromium directly in it)

export DISPLAY=:1
Xvfb $DISPLAY -screen 0 1024x768x16

GUI session that connects to same Xvfb $DISPLAY and renders desktop there

For XFCE use this

sudo apt install xfce4 xfce4-goodies

xfce4-session # start xfce4

For default gnome use this:

gnome-shell --replace # start ubuntu gnome

xvnc server (tightvncserver or x11vnc). x11vnc way better, because Copy+Paste works out of box and Chromium apps work. tightvncserver does not work chromium apps. VNC server also connects to $DISPLAY and provides the access to clients outside. Do not run as sudo!

sudo apt install x11vnc

Password setup

x11vnc -storepasswd

x11vnc -display $DISPLAY -forever -loop -noxdamage -repeat -rfbauth /home/ubuntu/.vnc/passwd -rfbport 5900 -shared

Final script that you add to crontab crontab -e with @reboot /path/to/script.sh

Run scripts in background using & syntax

For XFCE

#!/bin/bash
source /home/ubuntu/.bashrc
export DISPLAY=:1
Xvfb $DISPLAY -screen 0 2048x1536x24 &
xfce4-session &
x11vnc -display $DISPLAY -forever -loop -noxdamage -repeat -rfbauth /home/ubuntu/.vnc/passwd -rfbport 5900 -shared &

For default gnome

#!/bin/bash
source /home/ubuntu/.bashrc
export DISPLAY=:1
Xvfb $DISPLAY -screen 0 2048x1536x24 &
gnome-shell --replace &
x11vnc -display $DISPLAY -forever -loop -noxdamage -repeat -rfbauth /home/ubuntu/.vnc/passwd -rfbport 5900 -shared &

Thanks for the answer! This works for running the script manually, but when I run this script via a service or crontab, gnome-shell isn't loaded. Any idea why? — mattideluxe, Aug 29 '23 at 23:34
this works for me, the rest like install dummy not work. Any other long and many up votes dont work. But anydesk, xfce-terminal not work, get sig abort. Firefox and ms edge work — Tiana987642, Sep 03 '23 at 03:58

How do I install vnc on a headless ubuntu 20.10?

1 Answers1

Linked