There had not been much support for the unique setup which makes up Linux Mint (being technically labeled Ubuntu and LinuxMint) so needs either extra flags in the client generation process to allow for a linux mint Chroot to be generated for clients. As of Qiana, this should work out of the box. A testing PPA for linux mint support is available at ppa:bennabiy/testing which will contain specific bug fixes for linux mint, based on upstream code.