On Tue, 12 Dec 2017, Ted Roche wrote:
Booted into Windows 10 to start the annual TurboTax stuff, and it
asked to do an update, as usual. It turned out the "Features Update"
was an entirely new version of Windows 10, Fall Creator's Update
update, or something.
Rebooting to go back into Fedora 25, and the boot menu is gone, replaced with:
grub>
The fedoraproject page above suggests:
grub2-mkconfig -o /boot/grub2/grub.cfg
and
grub2-install --boot-directory=/boot /dev/sda
Finally, my question: are these last two commands correct with all the
variations of EFI, GPT, LVM, LUKS etc that is my configration? After
all this, I'd really hate to write to the wrong place!
For EFI booting the location of grub.cfg is /boot/efi/EFI/fedora/grub.cfg
which I am guessing has been corrupted by your Windows 10 update. As your
boot gets as far as the grub2 prompt this is probably all you have to fix,
eg.
grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
You could write the output of grub2-mkconfig somewhere else first so you
can check what it will do before you overwrite anything. eg.
grub2-mkconfig -o /tmp/grub.cfg
A good place to look for instructions is
https://fedoraproject.org/wiki/GRUB_2#Updating_GRUB_2_configuration_on_UEFI_systems
which includes the line
grub2-install shouldn't be used on EFI systems
so I don't suggest you use it.
Note Fedora 25 is going EOL (today, I think) so you might want to update
to a later version when you have everything working.
Michael Young
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