I just installed a fresh copy of ubuntu destop 10.10 on my (old) Acer laptop. I downloaded Synergy and Google-Earth's deb file and it opened with the Ubuntu Software Center.
Now in the applications menu I see a google earth and a synergy option, but they don't do anything. Nothing opens.
Did I do something wrong? Was there something I needed to do?
Thanks
Google Earth has a known bug. Try this answer to see if fixes that problem.
I can't help with Synergy - as João Pinto observes in his comment, try running
synergyc
(if you want your Ubuntu PC to be a client) orsynergys
if your Ubuntu PC will be a server in a terminal window to see what output you get.