MultiVNC is a cross-platform, Multicast-enabled VNC viewer. Features include support for most encodings, ZeroConf service discovery, a seamless edge control mode á la x2vnc, and most prominently, experimental support for VNC via multicast.
Install Multivnc in ubuntu
Download .deb package from here .Now you need to install .deb package by double clicking or using the following command from your terminal
sudo dpkg -i multivnc_0.2-1_i386.deb