TipsOnLightdm

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Steps

Install lightdm via:

$ sudo pacman -S lightdm

but this will cause gui startup failed.

Changes to lxdm solves the problem:

# pacman -S lxde
# systemctl enable lxdm.service
# vim /etc/lxdm/lxdm.conf
####autologin=dgod
# vim /root/.dmrc
[Desktop]
Session=xfce

Install:

# pacman -S xorg lightdm-gtk-greeter xterm xorg-xinit awesome
# vim /etc/lightdm.conf
greeter-session=lightdm-gtk-greeter

Add configuration for lightdm-gtk-greeter

Desktop Manager session:

 cat ~/.dmrc 
[Desktop]
Session=awesome

Install:

$ groupadd -r autologin
$ gpasswd -a root autologin
$ pacman -S xfce4-goodies
$ pacman -S awesome