vncserver: Failed command ‘/etc/X11/Xvnc-session‘: 256!

install vncserver The following error occurs during startup ：

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

Use xtigervncviewer -SecurityTypes VncAuth -passwd /root/.vnc/passwd :1 to connect to the VNC server.


vncserver: Failed command '/etc/X11/Xvnc-session': 256!

=================== tail -15 /root/.vnc/XXXX:1.log ===================
Copyright (C) 1999-2019 TigerVNC Team and many others (see README.rst)
See https://www.tigervnc.org for information on TigerVNC.
Underlying X server release 12008000, The X.Org Foundation


Thu Jun 30 09:08:25 2022
 vncext:      VNC extension running!
 vncext:      Listening for VNC connections on local interface(s), port 5901
 vncext:      created VNC server for screen 0
X connection to :1 broken (explicit kill or server shutdown).

Thu Jun 30 09:08:26 2022
 ComparingUpdateTracker: 0 pixels in / 0 pixels out
 ComparingUpdateTracker: (1:-nan ratio)
Killing Xtigervnc process ID 2451... which seems to be deadlocked. Using SIGKILL!

==========================================================================================

Starting applications specified in /etc/X11/Xvnc-session has failed.
Maybe try something simple first, e.g.,
	tigervncserver -xstartup /usr/bin/xterm

Then I run the following command according to the prompt ：

tigervncserver -xstartup /usr/bin/xterm

The following errors will be reported ：tigervncserver: Can't start '/usr/bin/xterm': No such file or directory!

Then install xterm

sudo apt install xterm

Run again tigervncserver -xstartup /usr/bin/xterm It still reports an error , But this time the mistake is different ：

X connection to :2 broken (explicit kill or server shutdown).

Thu Jun 30 09:19:55 2022
 ComparingUpdateTracker: 0 pixels in / 0 pixels out
 ComparingUpdateTracker: (1:-nan ratio)
Killing Xtigervnc process ID 5929... which seems to be deadlocked. Using SIGKILL!

When I can't figure it out , I see the following prompt in the error message ：

Starting applications specified in /etc/X11/Xvnc-session
Log file is /root/.vnc/XXXX:2.log

Use xtigervncviewer -SecurityTypes VncAuth -passwd /root/.vnc/passwd :2 to connect to the VNC server.

function ：

xtigervncviewer -SecurityTypes VncAuth -passwd /root/.vnc/passwd :2

Successful connection