Efibootmgr cant remove old OS entry

Support
#1

I realise this is more of a generic Linux question & not directly Manjaro, but Im hoping you can help regardless as it’s so hard to find good advice. I will be using Manjaro to complete this task.

I recently replaced Ubuntu with Nitrux on a 2nd partition. Now when I enter the UEFI bootmanager screen (F12) I can still see Ubuntu as well as Manjaro & Nitrux.

I removed this entry using sudo efibootmgr -b 0003 -B & it was apparently successful. However, after a reboot this entry was back again.
How should I get the removal to persist?

efibootmgr -v                                                    ✔ 
BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 0000,0005,0003,2001,2002,2003
Boot0000* manjaro	HD(1,GPT,b81116c0-132d-4850-aa2a-0aa263bea0df,0x800,0x100000)/File(\EFI\manjaro\grubx64.efi)
Boot0001* EFI PXE 0 for IPv4 (7C-8A-E1-80-E5-AB) 	PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0)/MAC(7c8ae180e5ab,0)/IPv4(0.0.0.00.0.0.0,0,0)RC
Boot0002* EFI PXE 0 for IPv6 (7C-8A-E1-80-E5-AB) 	PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0)/MAC(7c8ae180e5ab,0)/IPv6([::]:<->[::]:,0,0)RC
Boot0003* ubuntu	HD(1,GPT,b81116c0-132d-4850-aa2a-0aa263bea0df,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0005* Nitrux	HD(1,GPT,b81116c0-132d-4850-aa2a-0aa263bea0df,0x800,0x100000)/File(\EFI\Nitrux\shimx64.efi)
Boot2001* EFI USB Device	RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC
#2

Did you check the bootmanager in the “BIOS” of your computer? Maybe there you can remove the entry permanently.

#3

The BIOS does have an EFI section but it only allows me to re-order them.

#4

I believe you have to put the number in twice

sudo efibootmgr -b 0003 -B 0003

#5

man efibootmgr entry gives a use example:

Deleting a boot option
Assuming the configuration in the first example, efibootmgr -b 4 -B
could be called to delete entry 4 and remove it from the BootOrder.

I have tried both 3 & 0003 & in both cases it is deleted but it returns after a reboot.

efibootmgr -v                                        ✔  18m 48s  
BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 0000,0005,0003,2001,2002,2003
Boot0000* manjaro	HD(1,GPT,b81116c0-132d-4850-aa2a-0aa263bea0df,0x800,0x100000)/File(\EFI\manjaro\grubx64.efi)
Boot0001* EFI PXE 0 for IPv4 (7C-8A-E1-80-E5-AB) 	PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0)/MAC(7c8ae180e5ab,0)/IPv4(0.0.0.00.0.0.0,0,0)RC
Boot0002* EFI PXE 0 for IPv6 (7C-8A-E1-80-E5-AB) 	PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0)/MAC(7c8ae180e5ab,0)/IPv6([::]:<->[::]:,0,0)RC
Boot0003* ubuntu	HD(1,GPT,b81116c0-132d-4850-aa2a-0aa263bea0df,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0005* Nitrux	HD(1,GPT,b81116c0-132d-4850-aa2a-0aa263bea0df,0x800,0x100000)/File(\EFI\Nitrux\shimx64.efi)
Boot2001* EFI USB Device	RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC

    ~  sudo efibootmgr -b 3 -B                                          ✔ 
[sudo] password for rico: 
BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 0000,0005,2001,2002,2003
Boot0000* manjaro
Boot0001* EFI PXE 0 for IPv4 (7C-8A-E1-80-E5-AB) 
Boot0002* EFI PXE 0 for IPv6 (7C-8A-E1-80-E5-AB) 
Boot0005* Nitrux
Boot2001* EFI USB Device
Boot2002* EFI DVD/CDROM
Boot2003* EFI Network

Boot0003 returns after a reboot