Start synergy on boot in Ubuntu?

For newer version of Ubuntu that use lightdm.

I have successfully done the following for running the synergy client for the login screen, andafter I login. It is much simpler than the other answers, IMHO.

edit /etc/lightdm/lightdm.conf as root.

sudo vi /etc/lightdm/lightdm.conf

add the following line to the bottom of the file.

greeter-setup-script=/usr/bin/synergyc 

restart lightdm. (it is better to do this from a terminal or ssh session)

sudo /etc/init.d/lightdm restart

it works good in 12.10 for me