[HOW-TO] Installing XBIAN directly on RASPBIAN IMG

[raspi]

Hello,

I'm trying from yesterday to follow these steps with no luck.
After having some problems with my SDCARD (sudo apt-get install xbian-package-kernel just stuck at some step...), I moved to a boot system from usb external disk (I followed this excellent french article http://www.framboise314.fr/booter-le-raspberry-pi-sur-un-disque-dur-usb/).

My raspberry is a 256 M version.

So I have a SDCARD for the boot loader and my rootfs is on usb disk /dev/sda2 (formatted on ext4).
I installed the last availabale raspbian image from 07-Jan-2014.

Everything go ok now until the conversion step (last successful step is sudo apt-get install xbian-package-kernel; sudo reboot).

After the reboot, the system convert the partition /dev/sda2 to btrfs and then when it automatticaly reboot again I got plenty of messages rm can't remove: /proc/... Operation not permitted ... and then Kernel panic

Terminal

Switching root
/Init: line 209: can't open /rootfs/dev/console: no such file
Kernel panic: -not syncing: Attempting to kill init! exit code 0X00000200

BTW I observed the on post 1 is not anymore necessary to activate staging and devel repository. (The procedure goes until the end - no missing packages).
I precise that I tried to follow this procedure with both only stable or with devel staging, stable repos.
Both lead me to the same kernel panic.

Hope someone could help me!
Thank's