How to fix XOpenDisplay failed error?

U

Us592020-05-25 17:57:33

ubuntu

Us59, 2020-05-25 17:57:33

Installed X11VNC as instructed
Quote:

To run the program right now and check if it works, you can use the following command:

x11vnc -noxdamage -shared -dontdisconnect -many -noxfixes -rfbauth /etc/x11vnc.pass

25/05/2020 14:50:41 passing arg to libvncserver: -dontdisconnect
25/05/2020 14:50:41 passing arg to libvncserver: -rfbauth
25/05/2020 14:50:41 passing arg to libvncserver: /etc/x11vnc.pass
25/05/2020 14:50:41 x11vnc version: 0.9.13 lastmod: 2011-08-10  pid: 1622
25/05/2020 14:50:41 XOpenDisplay("") failed.
25/05/2020 14:50:41 Trying again with XAUTHLOCALHOSTNAME=localhost ...
25/05/2020 14:50:41
25/05/2020 14:50:41 *** XOpenDisplay failed. No -display or DISPLAY.
25/05/2020 14:50:41 *** Trying ":0" in 4 seconds.  Press Ctrl-C to abort.
25/05/2020 14:50:41 *** 1 2 3 4
No protocol specified
25/05/2020 14:50:45 XOpenDisplay(":0") failed.
25/05/2020 14:50:45 Trying again with XAUTHLOCALHOSTNAME=localhost ...
No protocol specified
25/05/2020 14:50:45 XOpenDisplay(":0") failed.
25/05/2020 14:50:45 Trying again with unset XAUTHLOCALHOSTNAME ...
No protocol specified
25/05/2020 14:50:45

25/05/2020 14:50:45 ***************************************
25/05/2020 14:50:45 *** 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.

I'm getting this error. Tell me how to fix?

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