sudo ls -lR /boot/efi
/boot/efi:
total 4
drwx------ 4 root root 4096 Sep 20 08:53 EFI

/boot/efi/EFI:
total 8
drwx------ 2 root root 4096 Sep 20 08:53 BOOT
drwx------ 2 root root 4096 Sep 20 08:53 ubuntu

/boot/efi/EFI/BOOT:
total 1092
-rwx------ 1 root root 1116024 Sep 20 08:53 BOOTX64.EFI

/boot/efi/EFI/ubuntu:
total 1096
-rwx------ 1 root root     128 Sep 20 08:53 grub.cfg
-rwx------ 1 root root 1116024 Sep 20 08:53 grubx64.efi