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[SOLVED] grub "chain loading" Arch not finding symbol
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chubbypiper
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Joined: 27 Jun 2018
Posts: 33

PostPosted: Sun Apr 21, 2024 3:00 am    Post subject: grub "chain loading" Arch not finding symbol Reply with quote

I'm sorry if this is not the correct place for this, but it came up as I was finishing an install, so I figured this is as good a place as any.

I just installed Gentoo on my desktop, with the intent of dual booting with the existing Arch install as I work to transition from Arch to Gentoo. When I installed grub, I put this in /etc/grub.d/40-custom:

Code:

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.

menuentry 'Arch Linux' --class gnu-linux --class gnu {
        search --no-floppy --fs-uuid --set=root CF40-3821
        set prefix=($root)/grub
        configfile /grub/grub.cfg
}


When I boot and select the "Arch Linux" menu entry, it does load the config file correctly, but when I select an item, it says:

Code:

Loading Linux linux-lts ...
error: symbol `efi_wrap_4' not found.
Loading initial ramdisk ...
error: symbol `efi_wrap_4' not found.

Press any key to continue...


When I press any key, it takes me back to the grub menu

Doing some searching, it seems like the suggested fix is to reinstall grub. I'm assuming this ultimately is a version mis-match of grub. The Arch package that's currently installed is grub-2:2.12-1-x86_64, and I'm on 2.12-r4. So, does anyone know how I am going to match up the release versions, and/or if it's easier, to actually chain load the two grub installs?


Last edited by chubbypiper on Mon Apr 22, 2024 2:07 am; edited 1 time in total
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sMueggli
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Joined: 03 Sep 2022
Posts: 489

PostPosted: Sun Apr 21, 2024 12:48 pm    Post subject: Reply with quote

Why not chainloading the Arch Linux Grub?

You can put in your 40_custom:

Code:
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.

menuentry "Arch Linux Chainload" {
    insmod part_gpt
    insmod fat
    insmod chain
    search --no-floppy --fs-uuid --set=root CF40-3821
    chainloader /EFI/arch/grubx64.efi  # set the correct path to Arch Linux Grub binary from the ESP root
}
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chubbypiper
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Joined: 27 Jun 2018
Posts: 33

PostPosted: Mon Apr 22, 2024 1:58 am    Post subject: Reply with quote

I had been trying to find information on how to do chain loading to another grub instance, but my google-fu was apparently lacking because I couldn't find information on it, just lots saying what I ended up doing (loading the GRUB config file). Thanks for the info. I'll give it a shot.
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chubbypiper
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PostPosted: Mon Apr 22, 2024 2:07 am    Post subject: Reply with quote

All good now. Thanks!
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