Hi,
I found a solution:
kernel tftp://${fog-ip}/boot/ubuntu/trusty/amd64/linux initrd tftp://${fog-ip}/boot/ubuntu/trusty/amd64/initrd.gz imgargs linux auto=true console-setup/layoutcode=fr keyboard-configuration/xkb-keyboard=fr locale=fr_FR.UTF-8 hostname=master domain=maestria.fr url=http://${fog-ip}/preseed_path/preseed_name.cfg quiet initrd=initrd.gz root=/dev/nfs netboot=nfs nfsroot=${fog-ip}:/tftpboot/boot/ubuntu/trusty/amd64/ bootIt’s look to work just need to configure my preseed file correctly.
Thank’s