Hello, I come here in desperate help after having been trying everything I have seen posted in different forums and wikis.
I used to have a dualboot with Ubuntu and Windows 10 in my HP notebook, until today when I decided to replace my Ubuntu with Manjaro.
The instalation completed successfully but to my surprise, it did not manage to boot. The system was trying to boot to the old Ubuntu entry in the UEFI table, which obviously would not work anymore and would simply prompt me to an empty grub screen.
I manually select the file to load from by chosing the option "boot from EFI file" in the f9 booting option menu.
I boot into manjaro and I attempt to modify the bootloader with efibootmgr, and yes, efivars was mounted with proper RW properties.
I delete some entries and everything seems to be working properly until I reboot. Once rebooted, it all had stayed the same.
I install efi shell so I have a closer interface to the hardware by using bcfg in case efibootmgr was buggy or not functioning well, but same results. It all seemed to work when in efibootmgr, but as soon as I rebooted, everything went back to what it was.
I booted once again manually into manjaro, and from there moved the old /boot/efi/EFI/ubuntu folder into somewhere else, and Voila, when rebooting the ubuntu entry is gone and it boots straight to windows 10, good progress.
I manage to boot into the EFI shell, and with instructions from the bcfg command i successfully add manualy an entry to the EFI tables, that WILL show in the f9 menu, but WILL NOT show in the boot manager options in the boot settings in the BIOS (Where only windows 10 will show as a way to boot)
And now, I still am stuck, trying to change the boot order but struggling with changes that reset after every single reboot.
Thank you for reading, I hope HP can help me with this one.
PD: I also updated today to the latest BIOS version.