Manually start Kerio VPN
You can simply remove any system startup links:
sudo update-rc.d -f kerio-kvc remove
Read more here: http://manpages.ubuntu.com/manpages/hardy/man8/update-rc.d.8.html
Kerio VPN Client will be automatically started after installation and restarted after reconfiguration. You can start/stop it manually by invoking the command:
# /etc/init.d/kerio-kvc {start|stop|restart}