Replace vino-server with x11vnc on ubuntu 10.04

vino-server效能不佳, 故以x11vnc替代之, 記得先停用vino-server:
sudo apt-get install x11vnc vnc4server
vncpasswd
x11vnc --quiet -ncache 10 -bg -reopen -forever \
-rfbauth ~/.vnc/passwd -display :0
ref: this.