Autostart Synergy before logging in (LightDM)
Add this line in /etc/lightdm/lightdm.conf: greeter-setup-script=/usr/bin/synergyc <OPTIONS> <SERVER HOSTNAME> session-setup-script=/usr/bin/killall -w synergyc ession-cleanup-script=/usr/bin/killall -w synergy display-stopped-script=/usr/bin/killall -w synergyc