I've been following the steps outlined in the following questions / tutorials.
Paddy Landau's Manual Full System Encryption:
https://ubuntuforums.org/showthread.php?t=2399092
C.S.Cameron addition:
How to Make BIOS/UEFI Flash Drive with Full Disk Encryption
I am able to create a live disk using the method outlined on the askubuntu link and it does boot UEFI with full encryption.
At first UEFI boot, I performed this step:
Now mount the ESP boot partition and copy ESP/EFI/ubuntu/grub.cfg and overwrite ESP/boot/grub/grub.cfg.
I did this and ran update-grub and update-grub2 and then rebooted the system.
The problem is that it does not boot legacy, only UEFI. When attempting to boot legacy, it loads the grub> menu.
Attempting to use ls or search, returns
error: file '/EFI/ubuntu/grub/i386-pc/ls.mod' not found.
grub shows these values set:
prefix=(hd0,gpt3)/EFI/ubuntu/grub
root=hd0,gpt3
When booted with UEFI and EFI partition is mounted, I can see the EFI folder listed about.
My EFI partition is 3 and this is the only drive, so the prefix and root should be correct.
Results of fdisk -l :
GParted:
Also, as seen in the fdisk, I do have an error within fdisk. This error was not initially present after creating the partitions with mkusb.
The backup GPT table is corrupt, but the primary appears OK, so that will be used.
