Haciendo copia de respaldo
Pasando a formato RAW
qemu-img: Could not open 'debian-rubinius.img'
Creo nuevo tamaño
0+0 records in
0+0 records out
0 bytes (0 B) copied, 3,4364e-05 s, 0,0 kB/s
Agrando tabla de particion
Warning: debian-rubinius.img.raw is not a block device
Disk debian-rubinius.img.raw: cannot get size
Disk debian-rubinius.img.raw: cannot get geometry

Disk debian-rubinius.img.raw: 0 cylinders, 0 heads, 0 sectors/track

sfdisk: ERROR: sector 0 does not have an msdos signature
 debian-rubinius.img.raw: unrecognized partition
Old situation:
No partitions found
New situation:
Units = sectors of 512 bytes, counting from 0

   Device Boot    Start       End   #sectors  Id  System
debian-rubinius.img.raw1            63        62          0  83  Linux
debian-rubinius.img.raw2             0         -          0   0  Empty
debian-rubinius.img.raw3             0         -          0   0  Empty
debian-rubinius.img.raw4             0         -          0   0  Empty
Warning: partition 1 has size 0 but is not marked Empty
Warning: no primary partition is marked bootable (active)
This does not matter for LILO, but the DOS MBR will not boot this disk.
Successfully wrote the new partition table

Re-reading the partition table ...
BLKRRPART: Inappropriate ioctl for device

If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes:  dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)
Convirtiendo nuevamente a formato QCOW-2
Terminado.