buuunt@pc:~$ sudo mount /dev/sdb1 /mnt && sudo ls -R /mnt && sudo umount /mnt
/mnt:
EFI

/mnt/EFI:
BOOT  ubuntu

/mnt/EFI/BOOT:
BOOTX64.EFI  fbx64.efi	mmx64.efi

/mnt/EFI/ubuntu:
BOOTX64.CSV  grub.cfg  grubx64.efi  mmx64.efi  shimx64.efi