Ubuntu 20.04
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Desktop Environment : Configure VNC Server2020/05/01

 
Install and Configure VNC Server to connect with GUI from remote clients.
[1] Install VNC server.
root@dlp:~#
apt -y install tigervnc-standalone-server
[2] Login with a user you'd like to set VNC. By the way, this example shows to use MATE Desktop on VNC connection.
# set VNC password

ubuntu@dlp:~$
Password:
Verify:
Would you like to enter a view-only password (y/n)?
n

# start VNC server

ubuntu@dlp:~$
vncserver :1

/usr/bin/xauth:  file /home/ubuntu/.Xauthority does not exist

New 'dlp.srv.world:1 (ubuntu)' desktop at :1 on machine dlp.srv.world

Starting applications specified in /etc/X11/Xvnc-session
Log file is /home/ubuntu/.vnc/dlp.srv.world:1.log

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

# stop once

ubuntu@dlp:~$
vncserver -kill :1

Killing Xtigervnc process ID 4123... success!
ubuntu@dlp:~$
vi ~/.vnc/xstartup
# create new (or add to the end)

exec /usr/bin/mate-session &
# start with diplay number [1], screen resolution [800x600]

ubuntu@dlp:~$
vncserver :1 -geometry 800x600 -localhost no


New 'dlp.srv.world:1 (ubuntu)' desktop at :1 on machine dlp.srv.world

Starting applications specified in /home/ubuntu/.vnc/xstartup
Log file is /home/ubuntu/.vnc/dlp.srv.world:1.log

Use xtigervncviewer -SecurityTypes VncAuth,TLSVnc -passwd /home/ubuntu/.vnc/passwd dlp.srv.world:1 to connect to the VNC server.
[3]
Install VNC viewer on client computer, this example in on Windows 10.
Download from the site below to install UltraVNC.
After installing UltraVNC, click [UltraVNC Viewer] to run, then, following screen is shown. Input [(Server's hostname or IP address):(display number)] like following example and then click [Connect] button.
[4] Password is required. Input VNC password you set in the section [2].
[5] Just connected.
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