Hi how to install Ubuntu 12.04+ with full disk encryption including encrypted boot partition : a- to a USB drive ie. 16GB or 32GB b- to a HDD
1) Download Ubuntu
2) Go to “How to create bootable USB”
3) Download Pen Drive Linux USB installer
4) Install the Pen Drive Linux USB installer
5) Locate the
6) Install it into any USB stick
7) Follow instructions from here
It can be incredibly beneficial to encrypt everything but your bootloader; obviously, your bootloader must remain cleartext. One answer here suggests to use the alternate installer to encrypt almost everything, but include unencrypted content on the internal hdd. This invites an "Evil Maid" attack: during a period when your computer is physically insecure an attacker may modify passphrase collection to store/send your key.
I have found the best approach makes use of special GRUB features for FDE, with GRUB installed on a USB. Detailed instructions here and here may be found for Archlinux, but the processes are easy to adapt and combine for your purposes.