Cannot get ubuntu install in SD card (beagleboard C4)

I have a problem trying to prepare a SD in order to use it on mu
beagleboard, I'll explain it fully:

First I Install Angstrom on a 7Gb SD card. (i make the two
partition... bla bla bla)

I felt prepare to make a step and install ubuntu on the beagleboard.
Then I erase all the data into the partition two on the SD and no
touch the partition one (inside that is the MLO, u-boot and uImage). I
copy the a prebuilt image ubuntu-10.04-minimal-armel.tar.7z (from so I decide to follow
all the manual step by step (I'm a beginner so strictly step by step,
I'm so obedient).
1: I download on my computer the ubuntu-10.04-minimal...tar.7z,
2: I go to download directory and tipe "7za x ubuntu-10.04-minimal-
armel.tar.7z" and get the *.tar
3: Then I type "tar xf ubuntu-10.04-minimal-armel.tar" and it work
correctly making the directory "ubuntu-10.04-minimal-armer". I get
into this directory typing "cd ubuntu-10.04-minimal-arme"
4: Here is the problem, when I type the next sentence: "./ --mmc /dev/sdX --uboot beagle_c4" the terminal said:
medel@ubuntu:~/Prueba_Ubuntu/ubuntu-10.04-minimal-armel$ ./ --mmc /dev/sdb2 --uboot beagle_c4
Are you sure? I Don't see [/dev/sdb2], here is what I do see...
sudo fdisk -l:

That my problem, I can't to take this step, I've tried typing:
./ --mmc /dev/sdX --uboot beagle_c4
./ --mmc /dev/sdb --uboot beagle_c4
./ --mmc /dev/sdb2 --uboot beagle_c4
(if I type: sudo fdisk -l i get:
medel@ubuntu:~/Prueba_Ubuntu/ubuntu-10.04-minimal-armel$ sudo fdisk -l
Disco /dev/sdb: 7948 MB, 7948206080 bytes
255 cabezas, 63 sectores/pista, 966 cilindros
Unidades = cilindros de 16065 * 512 = 8225280 bytes
Tamaño de sector (lógico / físico): 512 bytes / 512 bytes
Tamaño E/S (mínimo/óptimo): 512 bytes / 512 bytes
Identificador de disco: 0x09dd8ec6

Device Inicio Start End Bloques Id Sistema
/dev/sdb1 * 1 51 409626 c W95 FAT32
/dev/sdb2 52 966 7349737+ 83 Linux

but I failed. I'm so frustrated because I don't know what is it
maybe i need a non format target to install it?

I don't know so much can i do... could you help me? What I'm wrong?

(lot of thanks!)

That my problem, I can't to take this step, I've tried typing:
./ --mmc /dev/sdX --uboot beagle_c4

X stands for fill in with your own value...

./ --mmc /dev/sdb --uboot beagle_c4

This is the correct one ^.

thank so much about your reply.
Unfortunately I've tried using on mi computer these three option:
./ --mmc /dev/sdb --uboot beagle_c4
./ --mmc /dev/sdb1 --uboot beagle_c4
./ --mmc /dev/sdb2 --uboot beagle_c4
(my own value is sdB)

in all these cases end at the next screen:
"Are you sure? I Don't see [/dev/sdb2], here is what I do see..."
but it's really exist.

I'm trying to said that my problem isn't to fill my own value and
actually I can't install ubuntu lucid.

What can I do? shoud I keep trying to install this lucid or maybe
shoud I build my own ubuntu using OpenEmbedded?

Little lag on the group email list.. So for others with this problem
in the future..

Check the "" script for an improper language localization:

DISK_NAME="Disk|Platte" adding Spanish for Juan solved it..