MacOS/Debian10 dual boot- how to delete unknown EFI partition? I have a macbook air dual booting macOS Catalina and Debian10 buster. I hold the option key at startup to choose the system I want. In the boot manager there's this efi partition (https://imgur.com/xKoQiEK) that I would like to delete, because it starts nothing but grub bash minimal (https://imgur.com/a/T5bpHAp), but I have not been able to identify this partition neither from macOS 'diskutils' nor from Debian 'fdisk'.

How could I delete this partition?




EDIT:

Command diskutil list disk0 output:

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *512.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         305.9 GB   disk0s2
   3:       Microsoft Basic Data                         205.5 GB   disk0s3
   4:                        EFI NO NAME                 536.9 MB   disk0s4
You have two EFI partitions. Only one has the correct boot files. The other does not. You can try renaming a folder in the first EFI partition and see if this solves your problem. The commands are given below.

sudo disktuil mount disk0s1
mv /Volumes/EFI/EFI/BOOT /Volumes/EFI/EFI/NOBOOT
diskutil unmount disk0s1


If this does not solve your problem, then undo the above commands and try then other EFI partition. The commands are given below.

sudo disktuil mount disk0s1
mv /Volumes/EFI/EFI/NOBOOT /Volumes/EFI/EFI/BOOT
diskutil unmount disk0s1
sudo disktuil mount disk0s4
mv /Volumes/NO\ NAME/EFI/BOOT /Volumes/NO\ NAME/EFI/NOBOOT
diskutil unmount disk0s4


If this fixed your problem, then you should consider changing the label to something better than EFI Boot. And/or add an icon.