For a few days, my 2 PC have trouble getting started, it block with the boot on a black screen after display starting version 227 and root : clean xxx.
I am on Antergos, systemd227, gnome 3.18 and gdm. After 4 or 5 reboots, the login screen appears.
I ask on google+ forum and others persons have the same problem.
Do you have a solution?