Awsome wm on LL

[Moltke]

I've been having fun with some Vms I created and installed some WMs; fluxbox, openbox, enlightenment16, i3wm and awesome, and the one I like the most so far is awesome wm. With the rest of the VMs with Arch, CentOS 7, slackware and FreeBSD I had no problems with it, I guess it might be due to the fact that I installed everything; X, display manager, desktop...but with LL there's something I haven't figured out how to solve yet; why lightdm session manager doesn't show the option to choose a different session to login  other than fxce DE? how can I do that? I manage to login to awesome by replacing/removing the .desktop file but then I can no login to xfce. Any suggestios are really appreciated.
Check some captures and see how little resources it uses