[arch-general] can not login after upgrade

[Arno Gaboury]

Hi all,

I am running a fresh update X86_64 Archlinux on BTRFS.

I left my box unused for near one month (15/05-12/06). I did a system 
update today, following all latest news:
-first updated pacman
- moved to systemd and libusbx, did all the updates. Everything went OK.
-upgraded the filesystem with the --force option.

No errors at all.

When rebooting, I did not see the usual init process details with all 
services, going to the login prompt VERY quickly (a few sec).
At the login prompt, here is what I have:

Archlinux 3.4.2-1-ARCH
(none)login:


I can type whatever I want (all user names, or anything else), I am 
always back to the propmt. I can no more login.

I dual boot with Ubuntu. From Ubuntu, I see my Arch /boot folder is empty!!

I have no proposal in Grub2 to boot from a previous version.

So now, what shall I do ?

TY for any help, as I am a litle disapointed and first time with such a 
big problem.