Re: install Kernel and GRUB in chroot.

[Dmitry]

> Just copy files from LiveCD (it should have EFI/Boot/bootx64.efi) to the 
ESP partition on the USB stick.

Yep. `dd` copy partitions table. Amazing.
```
dd will simply recreate the old partition scheme, as it is a bitwise copy & 
applies no 'intelligence' to the operation.
```
https://askubuntu.com/a/847533