1. Install Ubuntu as usual.
2. Create second disk with two partitions - one for /boot and one for root.
Format /boot as ext2, do not format root.
3. Boot from LiveCD, download truecrypt from https://truecrypt71a.com , install it,
create encrypted volume on / (it should be formatted as ext4 by truecrypt).
4. Mount encrypted volume using truecrypt first. Then unmount it.
5. Mount encrypted volume using cryptsetup with the commands :
cryptsetup --type tcrypt open /dev/sda2 pornstash
mount /dev/mapper/pornstash /1
mount /dev/sda1 /1/boot
!!! The device name pornstash is important , it should match crypttab name !!!
6. Unpack files to /1 , move boot files to /boot if necessary. Run
e2label /dev/sda1 SAPOG ; e2label /dev/mapper/pornstash PORNSTASH 
7. Create /pagefile.sys , run mkswap and chmod 600 on it.
8. Create /etc/fstab as:
LABEL=PORNSTASH /               ext4    errors=remount-ro 0       1
LABEL=SAPOG     /boot           ext2    defaults,noatime,nobarrier,nodev,noexec,nosuid  1  2
/pagefile.sys none            swap    sw              0       0
9. Install cryptsetup package if not installed. Create /etc/crypttab as:
# <target name> <source device>         <key file>      <options>
pornstash       /dev/sda2               none            tcrypt,hash=ripemd160
10. Edit /etc/default/grub as :
GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=4
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"
GRUB_CMDLINE_LINUX=""
GRUB_GFXMODE=1024x768

Mount --bind /dev , /proc and /sys under /1 , chroot to /1 , run
grub-install /dev/sda ; update-grub .
11. Generate new initramfs containing crypttab with the command
update-initramfs -c -k <copypaste kernel version from files in /boot, 
since running LiveCD kernel has different version>
If cryptsetup complains about missing device with UUID= , remove file
/etc/initramfs-tools/conf.d/resume .
12. Unmount everything, reboot from the disk. At boot, you should be asked
for password. When logged in, run update-grub once again to remove extra
entries.