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Re: repair broken boot record

From: Thomas Danckaert
Subject: Re: repair broken boot record
Date: Tue, 05 Oct 2021 11:28:50 +0200
User-agent: Roundcube Webmail/1.4.2

Hello Florian,

thank you for your help. I managed to chroot into my system, and re-run 'guix system reconfigure' (very useful mailing list discussion on chrooting, I also vote for including it in documentation :) ). In one of the final steps, where guix tries to install the bootloader, I get the error:

/gnu/store/.../grub/i386-pc/ doesn't exist. Please specify --target or --directory.

Indeed my system uses grub-efi. Could that be related? Can you point me to some specific instructions on how to check/solve efivar issues?

Not sure if I need grub-efi, or if it might also work using grub-pc. Until now I've always used grub-efi.

(Another thing I noticed (maybe a side effect of chroot?): when I re-run 'guix system reconfigure' it tries to rebuild derivations that are already there in the store from last time, I think.)

thank you!


On 2021-10-01 08:53, pelzflorian (Florian Pelz) wrote:
On Thu, Sep 30, 2021 at 09:43:18AM +0200, Thomas Danckaert wrote:
Hello guix-help,

my system does not boot anymore after a guix pull and system reconfigure (which did show a warning, see below). It does not even enter the GRUB stage, I get a "Reboot and Select proper Boot device" instead. I think the MBR might not have been written correctly (just a hunch, I'm no expert...).

If this system uses no old grub-bootloader but instead EFI
(grub-efi-bootloader), maybe writing the bootloader to the mainboard
failed (it is not only written to disk), perhaps because the mainboard
NVRAM is full and needs to be cleaned with efibootmgr/efivar/such

During reconfigure, I did get a warning that my bootloader configuration used 'target', which is apparently deprecated in favor of 'targets'. I wasn't paying too much attention, and ignored the warning.... I don't know if that could be the cause of a missing or incorrect boot record? (In that
case, I suggest this warning should be an ERROR ;-) )

No, the old target would fall back to targets.  The warning is only a
warning that you should switch to (targets (list "…")).

I checked using a live USB, and it seems the whole system is still there on the hard drive. Is there a way to restore my system, keeping the existing /gnu/store? Or do I have to reinstall from scratch, remove the existing /gnu/store and rebuild everything (shouldn't be too much work using Guix,
but way less elegant :) )

Thank you!


I search on Duckduckgo for “ guix chroot”, you
should read there how to chroot into your system so you can


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