[Preseed] Partman expert recipe Error

Hi,

I'm stuck with partman expert_recipe for 3 days now and it's driving me crazy.

I've a 250GB hard drive and i try to use the following partition layout :

primary partition

512M /boot

4096M swap

LVM

10G /usr

20G /var

10G /

left free space to /home

so i use this recipe :

d-i partman-auto/expert_recipe string boot-root ::

512 513 512 ext3

$primary{ }

$bootable{ }

method{ format }

format{ }

use_filesystem{ }

filesystem{ ext4 }

mountpoint{ '/boot' }

1024 1025 4096 linux-swap

$primary{ }

method{ swap }

format{ }

1 10 -1 ext3

$primary{ }

method{ lvm }

vg_name { debian }

10240 10241 10240 ext4

$defaultignore{ }

lv_name{ lv_usr }

in_vg{ debian }

method{ lvm }

format{ }

$lvmok{ }

use_filesystem{ }

filesystem{ ext4 }

options/noatime{ noatime }

mountpoint{ '/usr' }

20480 20481 20480 ext4

$defaultignore{ }

lv_name{ lv_var }

in_vg{ debian }

method{ lvm }

format{ }

$lvmok{ }

use_filesystem{ }

filesystem{ ext4 }

options/noatime{ noatime }

mountpoint{ '/var' }

10240 10241 10240 ext4

$defaultignore{ }

lv_name{ lv_root }

in_vg{ debian }

method{ lvm }

format{ }

$lvmok{ }

use_filesystem{ }

filesystem{ ext4 }

options/noatime{ noatime }

mountpoint{ '/' }

1 10 -1 ext4

$defaultignore{ }

lv_name{ lv_home }

in_vg{ debian }

method{ lvm }

format{ }

$lvmok{ }

use_filesystem{ }

filesystem{ ext4 }

options/noatime{ noatime }

mountpoint{ '/home' }

The only things i get is "Available disk space (250059) is too small for expert recipe (15400000000).

This number 15400000000 is so huge. I think about a signed / unsigned error in partman. I try to follow the size allocation formula to see if something goes wrong but everything looks fine.

If someone can give me a hand on this, it would be greatly appreciated.

Regards,