[Nix-dev] Grub problem: external pointer tables not supported

[Roger Qiu]

Hey,

Changing nixos generations won't affect the grub boot partition, that only
changes which nixos kernel and initramfs image gets booted.

This looks like an error in the Grub partition. Maybe you recently updated
it or changed it, or the partition got corrupted.

This is why other operating systems tend to make their /boot read-only...

If you can't get into the OS, then you can try booting off a USB, and then
edit the boot partition. Or run the uefi terminal app (but this one never
worked for me). If you had cloned/raided boot partitions you can try
changing the uefi image to boot from in your uefi settings (access it like
BIOS).

Currently I have 2 uefi boot partitions cloned, but one failed so I've been
booting off the other one.

Thanks,
Roger
On 23/01/2017 10:48 PM, "Tomasz Czyż" <tomasz.czyz at gmail.com> wrote:

> Hello,
>
> recently my grub said this to me after I restarted computer:
>
> Error: external pointer tables not supported
> Error: you need to load the kernel first.
>
> Every option I select with nix (also past generations) shows me this
> message.
>
> I updated the system to 17.03pre99792.c311871 on 2016-12-23 and restarted
> it before multiple times (and worked). I don't remember if I did other
> updates, but this is what's grub menu shows me.
>
> My disk layout is: EFI boot partition for grub, next partition is
> encrypted luks volume and ZFS on top of it.
>
> This setup worked for me for 1.5 year now without any issue.
>
> Anybody is aware of any changes to grub/zfs recently or had same issue?
> Any suggestions how I can recover from it or what can be wrong?
>
> Tom
>
>
>
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>
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