linux user group brescia

Sera, pur avendolo già installato qualche tempo fa', ho deciso di
installare Xen nella mia Edgy.
Son riuscito a trovare una guida dettagliata per la mia distribuzione:
https://help.ubuntu.com/community/XenVirtualMachine/XenOnUbuntuEdgy
Ma quì sorge il problema: ;)

parte 3 del capitoletto:

domU
 The guest machines running under the xen hypervisor 
- Edgy

Mi dice: 
Loopback mount filesystem:  sudo
mount /usr/local/diskimage-guest.ext3 /mnt -o loop 

E io, avendo già creato il filesystem, procedo al mount:

giantux a giantux-desktop:~$ sudo
mount /usr/local/diskimage-guest.ext3 /mnt -o loop
mount: si deve specificare il tipo di filesystem

ok, mi dice che devo indicare il filesystem; avendo seguito la guida è
ext3 quindi aggiungo al comando la sintassi: -t ext3 ; ma mi viene
detto:

mount: wrong fs type, bad option, bad superblock on /dev/loop0,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

quindi,  come da suggerimento :) , procedo con: dmesg | tail ; e
ottengo:

giantux a giantux-desktop:~$ dmesg | tail
[69177.724161] VFS: Can't find ext3 filesystem on dev loop0.
[69177.725015] ReiserFS: loop0: warning: sh-2021: reiserfs_fill_super:
can not find reiserfs on loop0
[69193.919517] VFS: Can't find ext3 filesystem on dev loop0.
[69282.800556] VFS: Can't find ext3 filesystem on dev loop0.
[70212.833523] VFS: Can't find ext3 filesystem on dev loop0.
[70242.162540] cramfs: wrong magic
[70242.163891] VFS: Can't find ext3 filesystem on dev loop0.
[70242.166031] ReiserFS: loop0: warning: sh-2021: reiserfs_fill_super:
can not find reiserfs on loop0
[70362.603044] VFS: Can't find ext3 filesystem on dev loop0.
[70371.505695] VFS: Can't find ext3 filesystem on dev loop0.

Come procedere??
grazie in anticipo, 
	Gianluca