@santy4tas,
I could follow all the steps perfectly except for the last steps which says
Now mount the ESP boot partition and copy ESP/EFI/ubuntu/grub/grub.cfg and overwrite ESP/boot/grub/grub.cfg
Here appeared the first problem because the route ESP/EFI/ubuntu/grub is empty for me.
You must replace ESP by the actual mountpoint, where the ESP partition's file system is mounted, and if not mounted you must mount it.
Do you know how to mount a partition with mount?
Code:
sudo mount <block device> <mountpoint>
# for example
sudo mkdir /mnt/esp
sudo mount /dev/sda2 /mnt/esp
Even so, I tried to boot the USB from both, UEFI System and BIOS System. It shows the GRUB on boot:
The first screenshot shows the boot menu of a persistent live system made by mkusb. But you should boot into an installed system. Maybe your computer will boot into that system if you shut down your computer, unplug the persistent live drive and boot again.
Otherwise, I don't think it works to apply 'full disk encryption' to a persistent live system.
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