This is a nice GUI for network installs. Unfortunately, the daemons don't start in LinuxMint. This is because it is doing some logic based on the contents of /etc/lsb-release, but it doesn't know what to do when it finds 'DISTRIB_ID=LinuxMint'. To resolve the issue edit line 1007 of /usr/lib/python2.7/dist-packages/cobbler/utils.py and make the check_dist() function return "ubuntu". Then run 'sudo service cobbler start'.