On Tue, 12 Dec 2017, wwp wrote:
> Hello Michael,
>
>
> On Tue, 12 Dec 2017 17:12:04 +0000 (GMT) Michael Young
> <m.a.yo...@durham.ac.uk> wrote:
>
> > 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.
> [snip]
>
> I've experienced the same here, since then I'm no longer booting into
> Windows on my (dual-boot) laptop, but fixing it afterwards doesn't seem
> very satisfying, isn't it possible to prevent Windows from killing
> other systems from the EFI? How come such situation where Windows can
> do that?
I can't give a definite answer because I had this problem on a box but it
has stopped happening (it is running Windows Insider on the slow ring so
it gets updated a fair amount) and I am not sure if it was something I
did or just coincidence. I may have tried fscking the EFI partition but I
can't remember if that worked or made a difference.
Michael Young
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