FM / ubuntu

/boot/efi/EFI/ubuntu

Name	Size	Mode	Actions
BOOTX64.CSV	108	0755	edit dl rm
grub.cfg	117	0755	edit dl rm
grubx64.efi	2598792	0755	edit dl rm
mmx64.efi	856280	0755	edit dl rm
shimx64.efi	966664	0755	edit dl rm

Edit: /boot/efi/EFI/ubuntu/BOOTX64.CSV (108B)

shimx64.efi,ubuntu,,This is the boot entry for ubuntu