Fwd: grub2 user interface disappears after upgrade from stretch to testing

Hi Felix,

Thanks for your fast reply. From memory, I think the grub2 text menu
installed by firmware-9.6.0-amd64-netinst.iso became a grub command line
prompt after upgrading to testing.

1. For what possible reasons could have my grub menu disappeared?
2. You suggest I could boot Debian with "linux" and "initrd" commands. How
could I determine which parameters to pass to these commands?

On Tue, 13 Nov 2018 at 01:14, Felix Miata <[email protected]> wrote:

> Shane Dev composed on 2018-11-12 22:25 (UTC+0100):
>
> > Hello, I downloaded firmware-9.6.0-amd64-netinst.iso and successfully
> > installed a minimal debian stretch on my UEFI/GPT disk. After rebooting,
> I
> > was presented with the grub2 text user interface and the possibility to
> > boot Debian or my Windows boot manager - as expected.
>
> > Following https://wiki.debian.org/DebianTesting, I
> > edited /etc/apt/sources.list and changed stretch to testing, apt update
> &&
> > apt upgrade. Everything seemed ok but when I rebooted, the grub2 user
> > interface was gone and I could not find a way to boot Debian. Any ideas?
>
> By "gone", do you mean an entirely black screen? Or, do you see a few lines
> of help text followed by a
>
>         grub> _
>
> prompt? If the latter you can type in, along with tab completion, the
> commands
> to load "linux" and "initrd", just like a grub menu does for you, except
> you don't
> actually need everything the defaults usually provide, as any of it is
> necessary
> is included in the initrd. Those you need should be in your backup of
> grub.cfg.
>
> If you're getting nothing, try using your BIOS boot selection menu, which
> may
> have been poorly changed by the upgrade process to in inappropriate choice.
> Without actually entering BIOS setup it could be F12, F8, F9 or a number of
> other keystrokes that are firmware dependent.
>
> If you can't find your grub.cfg backup, use the following from one of mine
> as
> a template:
>
>         load_video
>         set gfxpayload=keep
>         search --no-floppy --set=root --hint-baremetal=ahci0,gpt10 --label
> p10deb10
>         linux   /boot/vmlinuz root=LABEL=p10deb10 noresume
>         initrd  /boot/initrd
> --
> Evolution as taught in public schools is religion, not science.
>
>  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
>
> Felix Miata  ***  http://fm.no-ip.com/
>
>