preserving dos partitions

[mamadou diop]

Hello, i have configured my /srv/fai/config/disk_config/FAIBASE so that
after installation the Windows
partition is preserved. I am sure that the Windows partition is preserved
because during installation,
setup_harddisks told me that the /dev/sda1 driver was going to be preserved.
Also, i have added the GRUB class to
my host. After installation, i didn't see Windows in the OS choice menu.
There are only Ubuntu in the menu of choice of
Operating Systems. What have i forgotten to do?