I'm using UEFI.

On Tue, Oct 30, 2018 at 2:43 PM stan <stanl-fedorau...@vfemail.net> wrote:
> On Tue, 30 Oct 2018 11:28:36 -0600
> linux guy <linuxguy...@gmail.com> wrote:
>
> > I have an up to date F28 server that boots to the grub prompt.   This
> > started after a failed dnf update.
> >
> > The computer will boot to an emergency mode command prompt if I set
> > it up properly from the grub prompt.
> >
> > grub> set root=(lvm/fedora-root)
> > grub> linuxefi (hd0,gpt2)/vmlinuz-0-rescue...
> > grub> root=/dev/mapper/fedora-root
> > grub>initrdefi (hd0,gpt2)/initramfs-0-rescue....img
> > grub>boot
> >
> > I can get networking working
> > #ls /sys/call/net   <- find Ethernet device is enp3s0
> > # ifup enp3s0
> > # ping www.google.com
> >
> > Now update it
> > # dnf update
>
> Does dnf give any errors because of the interrupted update?
>
> >
> > Regenerate the grub2 config file
> > # grub2-mkconfig
> >
> > Reboot
> > # shutdown -r now
> >
> > It still boots to the grub prompt.
> > Why does it boot to the grub prompt and what do I need to do to fix
> > it ?
>
> Two things you should try.
>
> 1.  If not already, remove rhgb and quiet from the kernel boot line so
> you can see the boot messages, and the final error that is throwing you
> into the grub prompt.
>
> 2.  After getting the system up and before you reboot, look in the
> journal to see what is reported about the issue causing the drop to a
> grub prompt.
> journalctl -b
> will show the last boot.
>
> That you have to set the root manually suggests to me that the boot
> record isn't pointing to the right place.  Correcting this is different
> for uefi and mbr, so you'll have to tell us which method you are
> using.  I don't see how this could happen from an interrupted dnf
> update unless the disk was somehow corrupted, but it is what it is.
> Maybe you should try running a non destructive file system check to see
> that the file system is intact.
>
> If you have a rescue cd or usb, it is a lot easier to boot it and do
> these kinds of things from a separate fully functioning system.
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