Role to install and configure X0 VNC Server
By default Wayland is enabled by default. This is a problem as it causes issues with VNC sessions to display :0.
In order to allow X0 or :0 access, one must disable Wayland AND select Gnome Xorg OR Gnome once Wayland has been disabled.
If you see something like this when running a VNC server manually, Wayland is likely still enabled.
$ x11vnc -forever -rfbauth /home/vagrant/.vnc/passwd
01/08/2019 07:04:21 passing arg to libvncserver: -rfbauth
01/08/2019 07:04:21 passing arg to libvncserver: /home/vagrant/.vnc/passwd
01/08/2019 07:04:21 x11vnc version: 0.9.13 lastmod: 2011-08-10 pid: 5088
01/08/2019 07:04:21 XOpenDisplay("") failed.
01/08/2019 07:04:21 Trying again with XAUTHLOCALHOSTNAME=localhost ...
01/08/2019 07:04:21
01/08/2019 07:04:21 *** XOpenDisplay failed. No -display or DISPLAY.
01/08/2019 07:04:21 *** Trying ":0" in 4 seconds. Press Ctrl-C to abort.
01/08/2019 07:04:21 *** 1 2 3 4
No protocol specified
01/08/2019 07:04:25 XOpenDisplay(":0") failed.
01/08/2019 07:04:25 Trying again with XAUTHLOCALHOSTNAME=localhost ...
No protocol specified
01/08/2019 07:04:25 XOpenDisplay(":0") failed.
01/08/2019 07:04:25 Trying again with unset XAUTHLOCALHOSTNAME ...
No protocol specified
01/08/2019 07:04:25
01/08/2019 07:04:25 ***************************************
01/08/2019 07:04:25 *** XOpenDisplay failed (:0)
*** x11vnc was unable to open the X DISPLAY: ":0", it cannot continue.
*** There may be "Xlib:" error messages above with details about the failure.Reboot your machine and check to see if vnc is running:
# systemctl status vnc
● vnc.service - Remote desktop service (VNC)
Loaded: loaded (/etc/systemd/system/vnc.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2019-08-01 07:11:57 GMT; 11s ago
Process: 482 ExecStart=/bin/bash -c x11vnc -forever -rfbauth /home/vagrant/.vnc/passwd & (code=exited, status=0/SUCCESS)
Main PID: 485 (x11vnc)
Tasks: 1 (limit: 1138)
Memory: 7.4M
CGroup: /system.slice/vnc.service
└─485 x11vnc -forever -rfbauth /home/vagrant/.vnc/passwd
Aug 01 07:11:57 buster systemd[1]: Starting Remote desktop service (VNC)...
Aug 01 07:11:57 buster systemd[1]: Started Remote desktop service (VNC).Login with this option (Select Gnome or Gnome Xorg):
