aptitude install debootstrap cryptsetup hashalot xfsprogs fdisk grub
echo -e "o\nn\np\n1\n\n+100M\nn\np\n2\n\n+200M\nn\np\n3\n\n\na\n1\nw\n" | sudo fdisk /dev/sda

sudo apt-get update
sudo modprobe dm_mod
sudo mkfs -t ext2 /dev/sda1
sudo mkswap /dev/sda2
sudo cryptsetup --verify-passphrase --verbose --hash=sha256 --cipher=aes-cbc-essiv:sha256 --key-size=256 luksFormat /dev/sda3
sudo cryptsetup luksOpen /dev/sda3 root
sudo mkfs -t xfs /dev/mapper/root

sudo mount /dev/mapper/root /mnt


sudo debootstrap --keyring=/etc/apt/trusted.gpg --include="dmsetup,cryptsetup,hashalot,initramfs-tools,nano" --components=main,universe --verbose --arch amd64 squeeze /mnt


echo "hostname" | sudo tee /mnt/etc/hostname
sudo cp /etc/network/interfaces /mnt/etc/network/
sudo cp /etc/resolv.conf /mnt/etc/
cat /etc/hosts | sed "s/`cat /etc/hostname`/`cat /mnt/etc/hostname`/" | sudo tee /mnt/etc/hosts

sudo nano /mnt/etc/initramfs-tools/modules


add the blow to /mnt/etc/initramfs-tools/modules:

# SCSI Discs
scsi_mod
sd_mod

# Encryption Stuff
aes
cbc
sha1
sha256


 sudo cp /mnt/usr/share/initramfs-tools/hooks/cryptroot /mnt/etc/initramfs-tools/hooks/
 sudo cp /mnt/usr/share/initramfs-tools/hooks/udev /mnt/etc/initramfs-tools/hooks/
 sudo cp /mnt/usr/share/initramfs-tools/scripts/local-top/cryptroot /mnt/etc/initramfs-tools/scripts/local-top/
 sudo cp /mnt/usr/share/initramfs-tools/scripts/init-premount/udev /mnt/etc/initramfs-tools/scripts/init-premount/

cp: cannot stat `/mnt/usr/share/initramfs-tools/scripts/init-premount/udev': No such file or directory