HP EliteBook 8570p Ubuntu grub is not launched

I have recently installed a dual boot on my EliteBook, and it works, except for the fact that the grub isn’t automatically loading.

When I turn on my computer, it goes back and forth indefinitely between the HP launching screep (with a gray logo in the center) to a black screen with an error message in the upper left corner (too fast to read).

I can manually escape this loop by pressing F9 then “Boot from EFI” –> “.[something here]” –> “ubuntu” –> grubx64.efi”, the grub then loads and I can choose between the Windows (10) or Ubuntu (18.04) launchers, so the grub itself is functionnal, but it doesn’t pop up without manual intervention.

I’ve found a few posts about efibootmgr and I read the manual, so I tried to use it.
It says :

BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 0000,0001,0002
Boot0000* Notebook Upgrade Bay
Boot0001* Notebook Hard Drive
Boot0002* Notebook Ethernet
Boot0003* ubuntu
Boot0004* ubuntu
...
Boot0013* ubuntu
Boot0014* Windows Boot Manager
Boot0015* ubuntu
...
Boot005F* ubuntu
(This definitely looks weird…)

$ sudo efibootmgr -n 0003 successfully sets NextBoot to 0003, but it only works once.

$ sudo efibootmgr -o 0003,0000,0001,0002 works too, and the options display

BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 0003,0000,0001,0002
...
But it seems to be overwritten upon restart, and the next launch goes into the infinite loop again, and options display the default BootOrder: 0000,0001,0002 again.

Thanks for your help, I can manage manually in the meantime but I would appreciate to not have to do this indefinitely…

P.S.: Is it really safe to remove the duplicates of BootXXXX* ubuntu using $ sudo -B -b 005F ? Is there a way to do it more than one at a time, like $ sudo -B -b 0030-005F or something else ?

…

I have now identified both the error message and the source of all these boots :

System BootOrder not found. Initializing defaults.

Creating boot entry "Boot007B" with label "ubuntu" for file "EFIubuntushimx.efi"


Reset system

I may have quite a bit of manual deleting on my hands…

…

I am back to a reasonable amount of boots (4), and I’ve tried to apply what was explained on the System BootOrder not found post, but I’m having trouble adapting to my own boot options panel… I do have a “Security” panel, but there’s no “load trusted EFI file” option in there… I tried a few things with the “Custom Boot” and “Secure Boot” options, but none of that was successful.

…

Nope, nothing works, I tried boot-repair too, but it doesn’t change a thing. I even went through reinstalling GRUB, but it did not solve my problem, and I’m out of ideas.

efibootmgr -v