Remmina RDP, VNC, NX, XDMCP, SSH, Telepathy клиент

• A pure GTK+ 2.0 application!
• Maintain a list of connection profiles, organized by groups
• Make quick connections by directly putting in the server address
• Remote desktops with higher resolutions are scrollable/scalable in both window and fullscreen mode
• Viewport fullscreen mode: remote desktop automatically scrolls when the mouse moves over the screen edge.
• Floating toolbar in fullscreen mode, allows you to switch between modes, toggle keyboard grabbing, minimize, etc.
• Tabbed interface, optionally managed by groups
• Tray icon, allows you to quickly access configured connection profiles

в общем так:

sudo add-apt-repository ppa:llyzs/ppa
sudo aptitude install remmina 

если что - то :

• Maverick: deb http://ppa.launchpad.net/llyzs/ppa/ubuntu maverick main
• Lucid: deb http://ppa.launchpad.net/llyzs/ppa/ubuntu lucid main
• Karmic: deb http://ppa.launchpad.net/llyzs/ppa/ubuntu karmic main
• Jaunty: deb http://ppa.launchpad.net/llyzs/ppa/ubuntu jaunty main

Then import the PPA key:
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5A0FA8F1

sudo aptitude install remmina