how to install a vncserver or vncviewer in Ubuntu

1. Download vnc4server

sudo apt-get install vnc4server

2. Modify ~/.vnc/xstartup

# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc

3. Change the permissions on the /etc/X11/xinit/xinitrc file to make it executable:

sudo chmod 755 /etc/X11/xinit/xinitrc

4. Start the vnc4server:

ielife@KevinLee-desktop:~$ vnc4server
Found /usr/share/vnc-java for http connections.

New 'KevinLee-desktop:1 (ielife)' desktop is KevinLee-desktop:1

Starting applications specified in /home/ielife/.vnc/xstartup
Log file is /home/ielife/.vnc/KevinLee-desktop:1.log

5. How to install vncviewer

sudo apt-get install xvnc4viewer

6. Login

xvnc4viewer
server:<ip>:<display number>
passwd:vncserver password

if use windows vncviewer:

address box:serverip:display number

then press connect button and input vncserver passwd.