Arch Linux

teagum

Member

Registered: 2024-11-07

Posts: 7

[SOLVED] grub.cfg differs from actual boot menu

This morgning, I ran

pacman -Syu

. After reboot, the grub menu showed up as usual. Then I hit enter to select the default boot. A moment later I was presented with the message

Failed to mount /boot

. I then restarted again and select the advanced options in the grub menu. Surprisingly, there are now 4 options: standard boot and fall-back for two different kernels. One kernel does boot, the other config causes the above error. I check /boot//gub.cfg, to see that there were indeed 4 submenu entries. Also, the linux, and initrd option referenced the files /vmlinuz-linux, and /initramfs-linux.img. i.e., files in the root directory. I then deleted those, and recreated the grub config. This is the relevant section of the newly generated /boot/grub.cfg:

menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-8789fc48-2024-41d2-aac8-d2f166450940' {
    load_video
    set gfxpayload=keep
    insmod gzio
    insmod part_gpt
    insmod fat
    search --no-floppy --fs-uuid --set=root E4F1-CFC3
    echo    'Loading Linux linux ...'
    linux    /vmlinuz-linux root=UUID=8789fc48-2024-41d2-aac8-d2f166450940 rw  loglevel=3 quiet nouveau.config=NvGsoRm=1
    echo    'Loading initial ramdisk ...'
    initrd    /intel-ucode.img /initramfs-linux.img
}
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-8789fc48-2024-41d2-aac8-d2f166450940' {
    menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-8789fc48-2024-41d2-aac8-d2f166450940' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod fat
        search --no-floppy --fs-uuid --set=root E4F1-CFC3
        echo    'Loading Linux linux ...'
        linux    /vmlinuz-linux root=UUID=8789fc48-2024-41d2-aac8-d2f166450940 rw  loglevel=3 quiet nouveau.config=NvGsoRm=1
        echo    'Loading initial ramdisk ...'
        initrd    /intel-ucode.img /initramfs-linux.img
    }
    menuentry 'Arch Linux, with Linux linux (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-fallback-8789fc48-2024-41d2-aac8-d2f166450940' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod fat
        search --no-floppy --fs-uuid --set=root E4F1-CFC3
        echo    'Loading Linux linux ...'
        linux    /vmlinuz-linux root=UUID=8789fc48-2024-41d2-aac8-d2f166450940 rw  loglevel=3 quiet nouveau.config=NvGsoRm=1
        echo    'Loading initial ramdisk ...'
        initrd    /intel-ucode.img /initramfs-linux-fallback.img
    }
}

After restart, grub still has 4 submenu entries, despite the above config. Two of them are working, and two produce the above error. can anybody help troubleshoot this?

Last edited by teagum (2024-12-10 06:33:39)

WorMzy

Administrator

From: Scotland

Registered: 2010-06-16

Posts: 13,514

Website

Re: [SOLVED] grub.cfg differs from actual boot menu

Please use code tags rather than quote tags for config files.

https://wiki.archlinux.org/title/Genera … s_and_code

Mod note: moving to NC.

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seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,681

Re: [SOLVED] grub.cfg differs from actual boot menu

This is the relevant section of the newly generated /boot/grub.cfg:

Can we please see the entire config?

"pacman -Syu" => "Failed to mount /boot" typically means you're booting an old kernel that lacks the modules on disk, so there's no vfat support and the /boot partition cannot be mounted.

newly generated /boot/grub.cfg

You want to check that path: https://wiki.archlinux.org/title/GRUB#G … d_grub.cfg

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teagum

Member

Registered: 2024-11-07

Posts: 7

Re: [SOLVED] grub.cfg differs from actual boot menu

Problem was, that during the system upgrade, grub.cfg was generated in /boot/grub.cfg instead of the default location /boot/grub/grub.cfg. Hence, I just dealt with the former, missing that latter.