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Ubuntu fully supports EFI (thus GPT due to the Windows EFI/GPT requirement) there is absolutely no reason to switch to MBR. Suspect the behavior is explained by hybrid shutdown (i.e. Fastboot). Try disabling hibernation and see if that helps.– RamhoundCommented Feb 28, 2020 at 17:22
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1I've been using EFI to boot Ubuntu for years, that's not the problem! The problem is that Windows Boot Manager seems to annihilate Grub. I will try disabling hibernation though.– Simon AldrichCommented Feb 28, 2020 at 17:24
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That is exactly the point. Ubuntu works just fine with GPT. So the advice to switch to MBR won't actually solve your particular problem, alright so it will solve your problem, because hybrid shutdown be enabled. However, just disabling hibernation will do that, so switching to MBR is to put it simply **bad advice.– RamhoundCommented Feb 28, 2020 at 17:28
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Some with HP have said UEFI update helps which it looks like you have done. But using efibootmgr to set boot order only works once. Grub uses efibootmgr to make it first in boot order with updates or Boot-Repair. Some also have said changing boot order in HP's UEFI then does stick or the edit of BCD so Windows sync of BCD & UEFI does not overwrite an Ubuntu entry.– oldfredCommented Feb 28, 2020 at 18:26
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One HP machine on which I wanted dual boot only worked when I renamed the original boot manager (bootmgfw.efi) and replaced it with the shimx64.efi or grub64.efi . See superuser.com/questions/1289741/dual-boot-ubuntu-disappeared and askubuntu.com/questions/244261/…– DrMoishe PippikCommented Feb 28, 2020 at 18:55
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