I have a laptop as a secondary machine, using F35. I've reluctantly had to install Windows 10 on another partition, and of course Windows has stamped all over the boot block in its usual arrogant way so I can no longer access my Fedora installation (though it's still there). What's the quickest way to get Grub back, with the Windows boot as an option? Can this be done from within Windows or do I need to boot a rescue drive? Both systems use UEFI.

On Sat, 2022-01-15 at 07:52 -0500, Jonathan Billings wrote: > On Jan 15, 2022, at 07:25, Patrick O'Callaghan > <pocallaghan(a)gmail.com&gt; wrote: >> I have a laptop as a secondary machine, using F35. I've >> reluctantly had >> to install Windows 10 on another partition, and of course Windows >> has >> stamped all over the boot block in its usual arrogant way so I can >> no >> longer access my Fedora installation (though it's still there). >> >> What's the quickest way to get Grub back, with the Windows boot as >> an >> option? Can this be done from within Windows or do I need to boot a >> rescue drive? Both systems use UEFI. > The great thing about UEFI is that it doesn’t involve boot sectors > anymore, it’s just files in the EFI volume and entries in the boot > firmware. > > You should be able to go into your BIOS boot menu and choose the > Fedora boot entry and it should boot just fine, unless the windows > install formatted the EFI volume, but it shouldn’t by default.  You > can also boot off a live USB and use ‘efibootmgr’ to change the boot > order. > > Be sure to turn off Fast Reboot in the Windows settings.  That > setting bypasses the normal firmware boot and you won’t see the > Fedora bootloader. Thanks. I did manage to boot Fedora by pressing the hotkey on restart. I really just want to add Windows as an option in the Grub menu so I don't have to do this. I'll look at efibootmgr. --

On Sat, 2022-01-15 at 12:24 -0500, Lester Petrie wrote: > > Thanks. I did manage to boot Fedora by pressing the hotkey on > > restart. > > I really just want to add Windows as an option in the Grub menu > > so > > I > > don't have to do this. I'll look at efibootmgr. > > -- > > If you can get into Fedora, grub2-mkconfig will rebuild your boot > menu > adding Windows. Thanks, that sounds like what I'm looking for.