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I finally find out what was the problem, and I saw it by using guestfish, since it was not working too. The command was this one:

guestfish --ro -a /var/lib/nova/instances/8bfb118a-ac1c-4634-9ec6-a6388693b4ba/disk -i

And the output this:

So I went deep into the supermin environment creation, finding out that there were a segfault while generating it:

root@compute1:~# update-guestfs-appliance ... Segmentation fault ...

I don't know why I got this problem, but launching it on a different ubuntu fresh install ended up correctly and so I took the content of /usr/lib/guestfs/supermin.d/ and put it on my compute node. After this (which is obviously a workaround) kyes where correclty injected into the image (and guestfish command worked too).

I finally find out what was the problem, and I saw it by using guestfish, since it was not working too. The command was this one:

guestfish --ro -a /var/lib/nova/instances/8bfb118a-ac1c-4634-9ec6-a6388693b4ba/disk -i-i


And the output this:

febootstrap-supermin-helper: ext2: parent directory not found: /lib: File not found by ext2_lookupext2_lookup


So I went deep into the supermin environment creation, finding out that there were a segfault while generating it:

root@compute1:~# update-guestfs-appliance
...
Segmentation fault
......


I don't know why I got this problem, but launching it on a different ubuntu fresh install ended up correctly and so I took the content of /usr/lib/guestfs/supermin.d/ /usr/lib/guestfs/supermin.d/ and put it on my compute node. After this (which is obviously a workaround) kyes where correclty injected into the image (and guestfish command worked too).