it is notable that the guest session is ultimately specified by lightdm itself. however, i had no problems with xubuntu (utopic fwiw), so i can confirm that this is indeed a problem with how lightdm's guest session interacts with lxsession.
it is notable that the guest session is ultimately specified by lightdm itself. however, i had no problems with xubuntu (utopic fwiw), so i can confirm that this is indeed a problem with how lightdm's guest session interacts with lxsession.