grub 2:2.14-1 cant boot iso image from hard drive via grub

pure71453 · 2026-04-20 11:39:08

I am tried to boot iso image from hard drive via grub but got error: disk /loopback.c: delete_loopback:67: device not found. Prev i just downgrade grub package and all works. But now i dont remember what old package version was working. How to fix it without downgrading grub package?

pure71453 · Yesterday 03:38:43

Same issue on eos, debian-testing

seth · Yesterday 06:03:33

Prev i just downgrade grub package and all works. But now i dont remember what old package version was working.

/var/log/pacman.log knows

If the downgrade helps, please record the functional version. Otherwise

I am tried to boot iso image from hard drive via grub

please post your grub.cfg

pure71453 · Yesterday 10:54:13

seth wrote:

Prev i just downgrade grub package and all works. But now i dont remember what old package version was working.
/var/log/pacman.log knows
If the downgrade helps, please record the functional version. Otherwise
I am tried to boot iso image from hard drive via grub
please post your grub.cfg

Can you boot any iso image from grub with loopback from hard drive?

GerBra · Yesterday 13:01:15

grub 2:2.14-1

Infos: Myself use btrfs AND my /boot folder is on the btrfs root device. My small ESP contains only the grub efi binary.
So my path entries contain /@/path_to.
Modify for your setup.
My iso images are in /boot-isos on btrfs root, so you may have to modify your paths according your setup
I try according like https://wiki.archlinux.org/title/Multib … ot_entries

I boot 2 iso images:
a) grml
https://download.grml.org/grml-full-2025.12-amd64.iso
/boot/grub/grub.cfg

menuentry "Grml Rescue System (grml-full 2025.12)" {
        insmod part_gpt
        insmod btrfs
        iso_path="/@/boot-isos/grml-full-2025.12-amd64.iso"
        export iso_path
        search --no-floppy --set root --file "$iso_path"
        kernelopts=" ssh=password toram  "
        export kernelopts
        loopback loop "$iso_path"
        set root=(loop)
        configfile /boot/grub/loopback.cfg
}

This boots perfectly and is usable

b) Archlinux install iso

menuentry '[loopback]archlinux-2026.03.01-x86_64.iso' {
    insmod part_gpt
    insmod btrfs
    set iso_path='/@/boot-isos/archlinux-2026.03.01-x86_64.iso'
    export iso_path
    search --set=root --file "$iso_path"
    loopback loop "$iso_path"
    set root=(loop)
    configfile /boot/grub/loopback.cfg
    #loopback --delete loop
}

This iso image boots perfectly (I see the uefi grub(?) menu) and could use ex. the memtest86
But: if i select to boot the archlinux setup entry it starts but break, see this picture:
https://paste.c-net.org/FlushLeukemia
But it seems (in an "own" hook ?) to setup another loopback device instead using the provided from main grub???
I work on this, the /boot/grub/loopback.cfg on the iso looks IMHO ok... Currently not my main project, i have not looked further now.

But you may get a inspiration...

Last edited by GerBra (Yesterday 13:39:57)

pure71453 · Today 01:34:12

GerBra wrote:

grub 2:2.14-1
Infos: Myself use btrfs AND my /boot folder is on the btrfs root device. My small ESP contains only the grub efi binary.
So my path entries contain /@/path_to.
Modify for your setup.
My iso images are in /boot-isos on btrfs root, so you may have to modify your paths according your setup
I try according like https://wiki.archlinux.org/title/Multib … ot_entries
I boot 2 iso images:
a) grml
https://download.grml.org/grml-full-2025.12-amd64.iso
/boot/grub/grub.cfg
menuentry "Grml Rescue System (grml-full 2025.12)" {
        insmod part_gpt
        insmod btrfs
        iso_path="/@/boot-isos/grml-full-2025.12-amd64.iso"
        export iso_path
        search --no-floppy --set root --file "$iso_path"
        kernelopts=" ssh=password toram  "
        export kernelopts
        loopback loop "$iso_path"
        set root=(loop)
        configfile /boot/grub/loopback.cfg
}
This boots perfectly and is usable
b) Archlinux install iso
menuentry '[loopback]archlinux-2026.03.01-x86_64.iso' {
    insmod part_gpt
    insmod btrfs
    set iso_path='/@/boot-isos/archlinux-2026.03.01-x86_64.iso'
    export iso_path
    search --set=root --file "$iso_path"
    loopback loop "$iso_path"
    set root=(loop)
    configfile /boot/grub/loopback.cfg
    #loopback --delete loop
}
This iso image boots perfectly (I see the uefi grub(?) menu) and could use ex. the memtest86
But: if i select to boot the archlinux setup entry it starts but break, see this picture:
https://paste.c-net.org/FlushLeukemia
But it seems (in an "own" hook ?) to setup another loopback device instead using the provided from main grub???
I work on this, the /boot/grub/loopback.cfg on the iso looks IMHO ok... Currently not my main project, i have not looked further now.
But you may get a inspiration...

downgrading package grub (2:2.14-1 => 2:2.12.r292.g73d1c959-1)
Iso images are located on separate ssd with ext4. Now i can boot any iso image via grub from hard drive with loopback.cfg
for linux mint:
menuentry "linuxmint" {
iso_path="/linux/linuxmint23/linuxmint-22.3-xfce-64bit.iso"
export iso_path
search --set=root --file $iso_path
loopback loop $iso_path
root=(loop)
configfile /boot/grub/grub.cfg
loopback --delete loop
}

pure71453 · Today 01:39:02

When maintainers will fix it?

cryptearth · Today 03:48:05

when someone has reported a proper issue: https://gitlab.freedesktop.org/gnu-grub … work_items

seth · Today 07:40:17

Iso images are located on separate ssd with ext4.

Does booting images (eg. tinycore will likely not be a problem itr) from the boot partition work and does it help to explicitly insmod part_gpt/ext4?
Is the separate disk SATA or USB?

Then that's not your grub.cfg but some random snippet and on a formal note, please use [code][/code] tags and avoid bloating the thread with mindless full-quotes of previous posts.

Arch Linux

#1 2026-04-20 11:39:08

grub 2:2.14-1 cant boot iso image from hard drive via grub

#2 Yesterday 03:38:43

Re: grub 2:2.14-1 cant boot iso image from hard drive via grub

#3 Yesterday 06:03:33

Re: grub 2:2.14-1 cant boot iso image from hard drive via grub

#4 Yesterday 10:54:13

Re: grub 2:2.14-1 cant boot iso image from hard drive via grub

#5 Yesterday 13:01:15

Re: grub 2:2.14-1 cant boot iso image from hard drive via grub

#6 Today 01:34:12

Re: grub 2:2.14-1 cant boot iso image from hard drive via grub

#7 Today 01:39:02

Re: grub 2:2.14-1 cant boot iso image from hard drive via grub

#8 Today 03:48:05

Re: grub 2:2.14-1 cant boot iso image from hard drive via grub

#9 Today 07:40:17

Re: grub 2:2.14-1 cant boot iso image from hard drive via grub

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