This Post Clearly Show How-to Install One of the Best Free VNC Viewers on Linux Lubuntu 13.04 Raring Ringtail i386/amd64 Xfce Desktop.
The RealVNC Viewer is Well Featured, has Really Good Performances and is Free from Most Vnc Viewer Linux Issues Especially that Concerning the Inexact Keys Replication.
More than this with RealVNC Viewer you can Scale Down a whole 1920x1200 Remote Desktop into a 13" Laptop 1280x800 Without Loosing too much Details!
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Download Latest RealVNC Viewer for Linux: 
- Open Terminal Window
   
- Relocate RealVNC Viewer - sudo su -c "mkdir /opt/bin" - sudo su -c "chmod +x <path/2>/VNC-Viewer-*" - sudo su -c "mv <path/2>/VNC-Viewer-* /opt/bin" 
- To Start RealVnc Viewer from Terminal - /opt/bin/VNC-Viewer-* 
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 Create a Launcher for Easy&Quick Starting: How Launcher for Xubuntu Menu
 
