No VNC extension on display :1

On Ubuntu 18.04 I ran sudo apt-get install tightvncserver. I then run vncserver which gives

New 'X' desktop is user:1

Starting applications specified in /etc/X11/Xvnc-session
Log file is /home/user/.vnc/user:1.log

as output. When I run more /home/user/.vnc/user:1.log I get

23/10/18 00:27:27 Xvnc version TightVNC-1.3.10
23/10/18 00:27:27 Copyright (C) 2000-2009 TightVNC Group
23/10/18 00:27:27 Copyright (C) 1999 AT&T Laboratories Cambridge
23/10/18 00:27:27 All Rights Reserved.
23/10/18 00:27:27 See http://www.tightvnc.com/ for information on TightVNC
23/10/18 00:27:27 Desktop name 'X' (user:1)
23/10/18 00:27:27 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t
23/10/18 00:27:27 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
No VNC extension on display :1
Killing Xtightvnc process ID 5196

I have no idea on how to resolve this issue and cannot find anything on No VNC extension on display :1.

Solution 1:

If you have installed tigervnc before tightvnc, it has replaced some files inside /etc/X11/. /etc/X11/Xvnc-session in particular, which will now call vncconfig, that in turn writes this message. vncconfig is not part of tightvnc, so it will silently die.

To fix this you will have to replace the contents of /etc/X11/Xvnc-session with the contents of ~/.vnc/xstartup or with a call to ~/.vnc/xstartup.