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Re: grub update and reinstallation

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hmh@debian.org - Henrique de Moraes Holschuh posted this on LWN.net
earlier. It's about as clear as it gets so I'm cheating and copying this
direct into debian-cd so that others see it: thanks for the clarity,
Henrique

>>

For Debian, most of the issues reported with the security update were
linked to bad configuration at package update time, and an extremely
annoying shortcoming of the package: it cannot rollback when it fails to
install to the boot media, and it doesn't crash and burn the update run
either, so it will not be noticed if you are not reading the update run
output.

Run dpkg-reconfigure on your grub2 variant, so that it asks for your boot
devices. Ensure it is correct, and let it update the bootloader on disk.
Watch to ensure no errors are reported (i.e. do it from the terminal, not
some GUI). This will sync everything.

Examples:
dpkg-reconfigure grub-efi-amd64
dpkg-reconfigure grub-pc

The other issue was a chain loader breackage on EFI, already fixed in the
current packages.

<<

[The second issue affected chainloading EFI  for, say, a Debian / Windows
10 dual boot]

The fixed packages are all there now
ZFS on Debian - strictly, it's off-topic here since it's not supported in
Debian at the moment.

On Mon, Aug 3, 2020 at 4:18 PM D. R. Evans <doc.evans@gmail.com> wrote:

> Tom Dial wrote on 8/1/20 9:31 PM:
>
> >
> > My experience, now on eight machines, indicates that it should be if the
> > installed, configured, and used versions of grub components is
> >
> > 2.02+dfsg1-20+deb10u2.
> >
> > I could be wrong, but here it has been the case for both UEFI (and root
> > on ZFS) and legacy boot setups, on both i386 and amd64. The only
> > exception is one root-on-ZFS VM that was slightly broken beforehand and
> > declines to boot for reasons I am fairly sure are unrelated to grub
> > installation.
> >
>
> So if one has two bootable drives (call them A and B), will this update
> update
> the MBR on both A and B, not just the one that happened to have been used
> for
> the most recent boot?
>
> I ask because I have a couple of root-on-ZFS BIOS-boot machines that are
> both
> configured as two-disk mirrors and I want to be sure that, following this
> upgrade, I can still boot off either of the two disks (as I can at the
> moment)
> without having to perform any manual changes.
>
> The use case is, if it's not obvious, that if under normal circumstances
> disk
> A is used for booting, but then at some point A fails (so ZFS is running
> in a
> degraded state) I can still boot from drive B if necessary.
>
>   Doc
>
> --
> Web:  http://enginehousebooks.com/drevans
>
>

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grub update and reinstallation Ross Boylan <rossboylan@stanfordalumni.org> - 2020-07-31 20:30 +0200
  Re: grub update and reinstallation Brian <ad44@cityscape.co.uk> - 2020-07-31 20:40 +0200
    Re: grub update and reinstallation Andrew Cater <amacater@gmail.com> - 2020-07-31 21:30 +0200
      Re: grub update and reinstallation Tom Dial <tddial@comcast.net> - 2020-08-01 09:10 +0200
        Re: grub update and reinstallation Graham Seaman <graham@theseamans.net> - 2020-08-01 13:30 +0200
          Re: grub update and reinstallation Sven Joachim <svenjoac@gmx.de> - 2020-08-01 15:10 +0200
            Re: grub update and reinstallation Graham Seaman <graham@theseamans.net> - 2020-08-01 19:30 +0200
              Re: grub update and reinstallation Andrew Cater <amacater@gmail.com> - 2020-08-01 22:00 +0200
              Re: grub update and reinstallation Tom Dial <tddial@comcast.net> - 2020-08-02 05:50 +0200
                Re: grub update and reinstallation Graham Seaman <graham@theseamans.net> - 2020-08-03 00:00 +0200
                Re: grub update and reinstallation Andrew Cater <amacater@gmail.com> - 2020-08-03 18:40 +0200
                Re: grub update and reinstallation Leslie Rhorer <lesrhorer@att.net> - 2020-08-03 23:50 +0200
          Re: grub update and reinstallation Tom Dial <tddial@comcast.net> - 2020-08-01 22:40 +0200
    Re: grub update and reinstallation Ross Boylan <rossboylan@stanfordalumni.org> - 2020-08-01 00:40 +0200

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