Hi, * Holger Wansing [Tue Oct 27, 2026 at 09:07:57PM +0100]: > Michael Prokop <[email protected]> wrote (Mon, 26 Oct 2026 12:27:33 +0100): > > As a starting point, what's the output of the following commands > > from your running Debian trixie system: > > > > dpkg -l | grep grub > > ned@t520:~$ dpkg -l | grep grub > ii grub-common 2.12-9+deb13u2 > amd64 GRand Unified Bootloader (common files) > ii grub-efi-amd64-bin 2.12-9+deb13u2 > amd64 GRand Unified Bootloader, version 2 > (EFI-AMD64 modules) > ii grub-efi-amd64-signed 1+2.12+9+deb13u2 > amd64 GRand Unified Bootloader, version 2 > (amd64 UEFI signed by Debian) > ii grub-efi-amd64-unsigned 2.12-9+deb13u2 > amd64 GRand Unified Bootloader, version 2 > (EFI-AMD64 images) > ii grub-pc 2.12-9+deb13u2 > amd64 GRand Unified Bootloader, version 2 > (PC/BIOS version) > ii grub-pc-bin 2.12-9+deb13u2 > amd64 GRand Unified Bootloader, version 2 > (PC/BIOS modules) > ii grub2-common 2.12-9+deb13u2 > amd64 GRand Unified Bootloader (common files > for version 2) > [...]
> But anyway, installing the 0.7.0 did not change anything: when selecting > the grml grub entry, the grub menu disappears for some seconds (so only > the graphical grub background is visible), and then the grub menu appears > again as in a usual boot process, and after the timeout is over, the > default entry (Debian Trixie) is booting. [...] Thanks, that was helpful. I managed to track down and reproduce your issue. Turns out that this is a regression of https://github.com/grml/grml-live/commit/5c048ce45afbe8ba61963828348780a20595b6d1 affecting the Grml 2026.09 ISOs. Technical details: In the GRUB menu when selecting the Grml ISO, $prefix points to (hd0,msdos1)/boot/grub. Now when furthermore sourcing (loop)/boot/grub/grub.cfg (from the ISO), the file /boot/grub/grml-theme/bios.txt can't be read, as it's expected to be at (hd0,msdos1)/boot/grub (instead of (loop)/boot/grub/). I managed to get a workaround within grml-rescueboot which addresses this. If you place the attached `42_grml` file as /etc/grub.d/42_grml and execute `update-grub`, you should get a working setup. This is a workaround only though, and I'd rather prefer if we manage to get this fixed within the Grml ISOs (as module loading might fail if GRUB from host and Grml ISO differ too much). This is what I'm trying to tackle in https://github.com/grml/grml-live/pull/648 So, to get it working: * use Grml ISOs <=2026.04 with grml-rescueboot (should just work OOTB) * use attached `42_grml` as /etc/grub.d/42_grml for booting Grml ISOs version 2026.09 * wait for upcoming Grml daily ISOs/stable releases, which should hopefully work within grml-rescueboot without requiring any further changes regards -mika-
#!/bin/sh # Filename: 42_grml # Purpose: grub-mkconfig helper script for Grml rescue systems # Authors: Grml team (grml.org), (c) Andreas Gredler <[email protected]>, Michael Prokop <[email protected]> # License: This file is licensed under the GPL v2+. ################################################################################ # shellcheck shell=dash set -e prefix=/usr exec_prefix=${prefix} libdir=${exec_prefix}/lib if [ -r "${libdir}/grub/grub-mkconfig_lib" ] ; then # shellcheck disable=SC1091 . "${libdir}/grub/grub-mkconfig_lib" elif [ -r /usr/share/grub/grub-mkconfig_lib ] ; then # fallback for e.g. Fedora # shellcheck disable=SC1091 . /usr/share/grub/grub-mkconfig_lib else echo "Could not locate file grub-mkconfig_lib, please report a bug." >&2 fi # default unless configured otherwise: ISO_LOCATION="/boot/grml" if [ -r /etc/default/grml-rescueboot ] ; then # shellcheck disable=SC1091 . /etc/default/grml-rescueboot fi resolve_dm_name() { retval="$1" base=${1##*/} for block in /sys/block /sys/class/block ; do [ ! -d "${block}/${base}/dm" ] && continue retval="/dev/mapper/$(cat "${block}/${base}/dm/name")" break done case "$retval" in /dev/dm-*) minor=${retval##*-} retval="/dev/mapper/$(dmsetup info -C --noheadings -o name -j 253 -m "$minor")" ;; esac echo "$retval" } get_dependencies() { device=${1} if [ -z "${device}" ] ; then return fi device=$(readlink -f "${device}") case "$device" in /dev/mapper/*) device="/dev/dm-$(dmsetup info -C --noheadings -o minor "$device")" ;; esac base=${device##*/} dependencies="" additional_dependencies="" for block in /sys/block /sys/class/block ; do [ ! -d "${block}/${base}/slaves" ] && continue for file in "${block}/${base}"/slaves/* ; do dep_name="/dev/${file##*/}" dep_name=$(resolve_dm_name "${dep_name}") # resolve recursively all dependencies additional_dependencies=$(get_dependencies "${dep_name}") dependencies="$dependencies $additional_dependencies $dep_name" done break done echo "$dependencies" } get_iso_identifier() { local iso="$1" local id= local date= if isoinfo --version >/dev/null 2>&1 ; then id=$(isoinfo -d -i "${iso}" | grep '^Volume id:' | sed -e 's/^[^:]*: *//') [ -n "${id}" ] || id=$(isoinfo -d -i "${iso}" | grep '^Application id:' | sed -e 's/^[^:]*: *//') date=$(isoinfo -debug -d -i "${iso}" 2>/dev/null | awk '/^Creation Date:/ {print $3$4$5}') fi if [ -n "${id}" ] && [ -n "${date}" ]; then echo "${id} [${date}]" else echo "${id}" fi } iso_list="" for file in "${ISO_LOCATION}"/*.iso ; do if grub_file_is_not_garbage "$file" ; then iso_list="$iso_list $file " fi done indent=' ' submenu_indent= if [ -n "${GRUB_SUBMENU}" ] && [ -n "${iso_list}" ] ; then echo "submenu \"${GRUB_SUBMENU}\" \$menuentry_id_option \"grml-rescueboot\" {" submenu_indent="${indent}" fi for grmliso in $iso_list ; do rel_dirname="$(dirname "$(make_system_path_relative_to_its_root "$grmliso")")" grml="$(basename "$grmliso")" # shellcheck disable=SC2154 # grub_probe is defined by grub-mkconfig_lib device="$("${grub_probe}" -t device "${grmliso}")" additional_param="" case "$device" in /dev/mapper*|/dev/md*) dependencies=$(get_dependencies "${device}") dep_string="" for dep in $dependencies $device ; do case "$dep" in /dev/md*) md_name="$(mdadm --detail --export "$dep" | sed -ne 's/MD_NAME=//p')" dep="/dev/md/$md_name" esac dep_string="$dep_string,$dep" done dep_string=${dep_string#,} additional_param="live-media=$dep_string" ;; esac echo "Found grml-rescueboot ISO image: ${grmliso}" >&2 iso_id=$(get_iso_identifier "${grmliso}") if [ -n "${iso_id}" ] ; then title="${iso_id} (${grml})" else title="${grml}" fi grub_prep=$(prepare_grub_to_access_device "${device}" | sed -e "s/^/${indent}/") grub_iso_path="${rel_dirname%/}/${grml}" sed -e "s/^/${submenu_indent}/" << EOF menuentry "${title}" { ${grub_prep} iso_path="${grub_iso_path}" export iso_path kernelopts=" $CUSTOM_BOOTOPTIONS $additional_param " export kernelopts # support booting recent GRUB versions on UEFI systems # (see bugs.debian.org/959425) rmmod tpm loopback loop "\$iso_path" set root=(loop) # Grml >= 2026.09 resolves its config via \$prefix (grml-live 5c048ce), # so point it at the ISO; preload modules from the host GRUB first insmod regexp insmod linux insmod all_video insmod gfxterm insmod gfxmenu insmod png set grml_orig_prefix="\$prefix" set prefix=(loop)/boot/grub configfile /boot/grub/loopback.cfg set prefix="\$grml_orig_prefix" unset grml_orig_prefix unset root loopback -d loop unset iso_path unset kernelopts } EOF done if [ -n "${GRUB_SUBMENU}" ] && [ -n "${iso_list}" ] ; then echo "} # end submenu \"${GRUB_SUBMENU}\"" fi ## END OF FILE #################################################################
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