Boot priority options

[Flo_]

Hi, I need help setting the priority for the bootloader in a dual boot NOTEBOOK (Ubuntu 20.04 and win 10).

As you can see here (https://support.hp.com/it-it/product/hp-15-bw000-laptop-pc/15551418/document/c03854522#AbT4) you can easly access the boot menu option with F9, the only problem is that I can choose to use the UEFI bootloader for linux or windows, but I can't set the ubuntu one as the default option. How can i change it?

Currently I removed the fast boot and I'm pressing F9 every time, but I just would like to use the grub (bootloader fo linux), because the grub has already the option for windows, so I would be able to access both OS.
I tried to change the default option for the OS in the windows interface, but I can't choose linux, because the interface shows just windows as an option (I already changed the time you have to choose between the options, but it doesn't show anything). The linux partition is already visible from windows, but I can't access it (like browsing for files).

Thank you in advance for your reply, also just a hint would be very appreciated!

[WAWood]

@Flo_ 

I'm sorry, but HP only warranties their PCs for usage with the OS that comes preinstalled.

IF you replace that with a Linux distro, or add a Linux distro, then you assume full responsibility for maintaining that -- including solving any problems with booting the other OS and/or installing the other OS.

Modern PCs with UEFI, instead of the older BIOS, are especially difficult to install because you have to go into the UEFI settings and make several changes before you can even boot from a USB stick -- and we are unable to assist in that work.

Your best bet for support now is to contact the support forum of the distro you are using.

Since you are using Ubuntu, go here: https://ubuntuforums.org/

Good Luck