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kgdrenefort
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PostPosted: Tue Sep 19, 2023 6:47 am    Post subject: [ABORTED] Gentoo not detected by Debian's GRUB Reply with quote

Hello,

This topic is out-dated, an installation with LVM seems to brings too many problems as it is for now. I re-installed the system, and I have still problem to boot it up, more here.

Thanks for your time and help, will try to close this topic.


this is the context:

I use SystemD Stage and follow the AMD64 Handbook.

From Debian 12 I resized my hard drive and set up a volume group (LVM) of 250Gb to host a Gentoo fresh installation. Both hard drive containing OS are using GPT tables. Alongside them there is also a Windows 11. I used a chroot to install Gentoo from Debian.

In that volume group I have:

/ : 64Gb, ext4
/home: 128Gb, ext4
/usr/src: 10Gb, ext4
/var/cache/distfiles: 30Gb, ext4
/var/tmp/portage: tmpfs

In fstab these partition are mounted like this:
Code:
### LVM
### https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/System#Filesystem_information
### "UUIDs of the filesystem on a LVM volume and its LVM snapshots are identical, therefore"
### "using UUIDs to mount LVM volumes should be avoided."
# /dev/mapper/vg0_gentoo-lv_vol1_gentoo_home: UUID="ea4955a7-b38c-4572-a7e0-33e8461f56ab" BLOCK_SIZE="4096" TYPE="ext4"
# /dev/mapper/vg0_gentoo-lv_vol1_gentoo_usr_src: UUID="a17cf1de-a5dc-44ff-a2bb-e4f542d90f96" BLOCK_SIZE="4096" TYPE="ext4"
# /dev/mapper/vg0_gentoo-lv_vol1_gentoo_root: UUID="6a2be7fa-b2e3-45d7-bef1-3c763ffc6b07" BLOCK_SIZE="4096" TYPE="ext4"
# /dev/mapper/vg0_gentoo-lv_vol1_gentoo_var_cache_distfiles: UUID="4be17401-b3d6-405a-a392-91a58e09d9d9" BLOCK_SIZE="4096" TYPE="ext4"

# /
/dev/mapper/vg0_gentoo-lv_vol1_gentoo_root   /   ext4   defaults,noatime   0 1

# /home
/dev/mapper/vg0_gentoo-lv_vol1_gentoo_home   /home   ext4   defaults,noatime   0 2

# Swap
# No swap, not very good with tmpfs. In emergency, using a swap file could do the tricks.

# /usr/src
/dev/mapper/vg0_gentoo-lv_vol1_gentoo_usr_src   /usr/src   ext4   defaults,noatime   0 2

# /var/cache/distfiles
/dev/mapper/vg0_gentoo-lv_vol1_gentoo_var_cache_distfiles   /var/cache/distfiles   ext4   defaults,noatime   0 2

# /var/tmp/portage
# https://wiki.gentoo.org/wiki/Portage_TMPDIR_on_tmpfs
# "The size parameter can be adjusted in /etc/fstab to set the max size of the tmpfs,"
# "limiting RAM usage. Systems with large amounts of RAM can increase the value quite"
# "significantly."
#
# From @sam on #gentoo@libera.eu.chat: having only 8Gb left for system is a terrible idea.
# 16Gb is probably more suited with 32Gb of memory.
tmpfs   /var/tmp/portage   tmpfs   size=16G,uid=portage,gid=portage,mode=775   0 0


EDIT: While composing this message, I just realized that Debian is mounting the /boot/efi partition at boot, while Gentoo was not. So I added this line:

Code:
UUID=569B-9899  /boot/efi       vfat    umask=0077      0       1

[i](Same, exact problem, but at least I think I needed it…)
[/i]

After some days of questionning and trying, I got a newly installed Gentoo… that is unbootable in that state. GRUB (from Debian) don't detect it if using os-prober, updating grub and re-installing it on my main drive (where are Debian and Windows main partition, / and C:, as the ESP partition).

If I try to boot directly on that hard drive (with Gentoo LVM VG), I get a GRUB error:

Code:
GRUB Loading.
Welcome to GRUB!

error: file '/boot/grub/i386-pc/normal.mod' not found.
grub rescue> _


The thing is while installing Gentoo's bootloader, midway I realized I should keep GRUB from Debian «just in case» and just add Gentoo. I removed since sys-boot/grub, removed the GRUB_PLATFORMS line.

And now I'm stuck.

Other things I noted on my Gentoo's chroot that /boot is very different from Debian:

On Gentoo:
Code:
Desktop / # ls /boot/*
/boot/config-6.1.53-gentoo-dist         /boot/System.map-6.1.53-gentoo-dist        /boot/vmlinuz-6.1.53-gentoo-dist
/boot/initramfs-6.1.53-gentoo-dist.img  /boot/System.map-6.1.53-gentoo-x86_64.old  /boot/vmlinuz-6.1.53-gentoo-x86_64.old

/boot/grub:



On Debian:
Code:
[08:26:01]
[Kernel: 6.1.0-12-amd64 - Debian: 12.1]
[root]@[Desktop] [~]
# ls /boot/*
/boot/config-6.1.0-12-amd64  /boot/initrd.img-6.1.0-12-amd64  /boot/System.map-6.1.0-12-amd64  /boot/vmlinuz-6.1.0-12-amd64

/boot/efi:
EFI

/boot/grub:
fonts  grub.cfg  grubenv  locale  unicode.pf2  x86_64-efi

/boot/lost+found:


The ESP partition is on the same hard drive as Debian and Windows, but not Gentoo. This partition contains as you can see here:
Code:
[08:28:53]
[Kernel: 6.1.0-12-amd64 - Debian: 12.1]
[root]@[Desktop] [~]
# ls /boot/efi/EFI/
Boot  debian  Microsoft


I think, and I could be very wrong, that Gentoo don't «know» where is the ESP partition.

Since I'm not sure what is relevant, a few files and command output that seems always important:

Code:
Desktop / # cat /etc/portage/make.conf
# These settings were set by the catalyst build script that automatically
# built this stage.
# Please consult /usr/share/portage/config/make.conf.example for a more
# detailed example.
COMMON_FLAGS="-march=native -O2 -pipe"
CFLAGS="${COMMON_FLAGS}"
CXXFLAGS="${COMMON_FLAGS}"
FCFLAGS="${COMMON_FLAGS}"
FFLAGS="${COMMON_FLAGS}"

# NOTE: This stage was built with the bindist Use flag enabled

# This sets the language of build output to English.
# Please keep this setting intact when reporting bugs.
#LC_MESSAGES=C.ut8
LC_MESSAGES=fr_FR.utf8

MAKEOPTS="-j12"
#PORTAGE_SCHEDULING_POLICY="idle"

USE="-gtk -gnome grub qt5 qt6 kde dvd dvdr alsa cdr bash-completion bluetooth colord crypt css cups curl ffmpeg flac gif gimp git gstreamer gui gzip handbook hddtemp icu jack javascript jpeg jpeg2k lm-sensors man matroska mp3 mp4 mpeg mplayer mtp ncurses networkmanager nocd nvenc ogg pdf png posix pulseaudio raw rdp readline scanner smp snmp sound spell ssl syslog systemd udev udisks uefi unicode upower usb v4l vcd verify-sig videos vim-syntax vorbis vulkan wayland webkit x264 xattr xml xmpp zip lvm gles2"

VIDEO_CARDS="nvidia vesa amdgpu"

ACCEPT_LICENSE="-* @FREE @BINARY-REDISTRIBUTABLE"


From Debian:
Code:
[08:28:55]
[Kernel: 6.1.0-12-amd64 - Debian: 12.1]
[root]@[Desktop] [~]
# fdisk -l
Disk /dev/sda: 238.47 GiB, 256060514304 bytes, 500118192 sectors
Disk model: Samsung SSD 850
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 39A3DDF1-4DAD-4175-B6F2-4DB1636C6C7A

Device         Start       End   Sectors   Size Type
/dev/sda1       2048   1085439   1083392   529M Windows recovery environment
/dev/sda2    1085440   1290239    204800   100M EFI System
/dev/sda3    1290240   1323007     32768    16M Microsoft reserved
/dev/sda4    1323008 249399295 248076288 118.3G Microsoft basic data
/dev/sda5  249399296 250718207   1318912   644M Windows recovery environment
/dev/sda6  250720256 281970687  31250432  14.9G Linux swap
/dev/sda7  281970688 283924479   1953792   954M BIOS boot
/dev/sda8  283924480 342517759  58593280  27.9G Linux filesystem
/dev/sda9  405745664 500117503  94371840    45G Linux filesystem
/dev/sda10 342517760 403455259  60937500  29.1G Linux filesystem
/dev/sda11 403456000 405745663   2289664   1.1G Linux filesystem

Partition table entries are not in disk order.


Disk /dev/sdc: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: WDC WD10EZEX-00B
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x02e41f56

Device     Boot     Start        End   Sectors   Size Id Type
/dev/sdc1            2048  976760831 976758784 465.8G  7 HPFS/NTFS/exFAT
/dev/sdc2       976760832 1953523711 976762880 465.8G 83 Linux


Disk /dev/sdb: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: Samsung SSD 860
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 926A88DB-E42A-4526-9013-B5F302971C07

Device          Start        End    Sectors   Size Type
/dev/sdb1          34      32767      32734    16M Microsoft reserved
/dev/sdb2       61440 1429233663 1429172224 681.5G Microsoft basic data
/dev/sdb3  1429233664 1953523711  524290048   250G Linux filesystem


Disk /dev/mapper/vg0_gentoo-lv_vol1_gentoo_root: 64 GiB, 68719476736 bytes, 134217728 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/vg0_gentoo-lv_vol1_gentoo_home: 128 GiB, 137438953472 bytes, 268435456 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/vg0_gentoo-lv_vol1_gentoo_usr_src: 10 GiB, 10737418240 bytes, 20971520 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/vg0_gentoo-lv_vol1_gentoo_var_cache_distfiles: 30 GiB, 32212254720 bytes, 62914560 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


What is puking Debian if I try to detect Gentoo:

Quote:
[08:42:44]
[Kernel: 6.1.0-12-amd64 - Debian: 12.1]
[root]@[Desktop] [~]
# os-prober
/dev/sdb2@/EFI/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
[08:44:45]
[Kernel: 6.1.0-12-amd64 - Debian: 12.1]
[root]@[Desktop] [~]
# update-grub
Generating grub configuration file ...
Found background image: /usr/share/images/desktop-base/desktop-grub.png
Found linux image: /boot/vmlinuz-6.1.0-12-amd64
Found initrd image: /boot/initrd.img-6.1.0-12-amd64
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Found Windows Boot Manager on /dev/sdb2@/EFI/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for UEFI Firmware Settings ...
done
[08:45:12]
[Kernel: 6.1.0-12-amd64 - Debian: 12.1]
[root]@[Desktop] [~]
# grub-install /dev/sdb
Installing for x86_64-efi platform.
Installation finished. No error reported.


Kind of lost here. Have you an idea to wake up Gentoo ?

Regards,
GASPARD DE RENEFORT Kévin
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Last edited by kgdrenefort on Fri Oct 06, 2023 10:16 am; edited 1 time in total
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pc_user4
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PostPosted: Tue Sep 19, 2023 7:07 am    Post subject: Reply with quote

Hello kgdrenefort,

I could be wrong, but from inspecting your setup, it seems that Debian installed the bootloader to the ESP created by Windows, but in your actual Debian install, the /boot and /boot/efi appear to be within the context of your / partition.

If you run df after boot, see if your ESP partition is showing up in the list. This is an easy way to see if it had been loaded by the OS.

Potentially, you need to make sure to unmount the ESP after booting into both Debian and Gentoo separately, where you can then find if there are files within /boot or /boot/efi which are actually on the / partition, then remove the contents of those directories if this is the case. Then you would mount the real ESP (which contains the folders 'debian' and 'Microsoft') and re-run the grub-install. Hopefully, after doing this on both Linux installs, you have a Grub menu for Gentoo, Debian and Windows.

If you use systemd, I would recommend systemd-boot over grub, there is much less that can go wrong - if you are on OpenRC this is obviously not an option. I feel that maybe systemd-boot adoption is sparse in the Gentoo community so if a guide would be helpful, I could write one.



edit:
I've seen that you have two boot partitions
Code:
/dev/sda2    1085440   1290239    204800   100M EFI System
/dev/sda7  281970688 283924479   1953792   954M BIOS boot


Likely /dev/sda7 "BIOS boot" is not needed. I don't see it in your fstab? I'm not sure that it's doing anything.
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kgdrenefort
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PostPosted: Tue Sep 19, 2023 9:51 am    Post subject: Reply with quote

pc_user4 wrote:
Hello kgdrenefort,

I could be wrong, but from inspecting your setup, it seems that Debian installed the bootloader to the ESP created by Windows, but in your actual Debian install, the /boot and /boot/efi appear to be within the context of your / partition.


I can't remember honnestly, so far:

- I installed Windows 11 by replacing 10
- I had to re-install this Debian 12 after some time for no related reasons

So it's possible that this ESP partition come from Windows, I have to many old habbits from BIOS I didn't completly get rid off I guess.


pc_user4 wrote:
If you run df after boot, see if your ESP partition is showing up in the list. This is an easy way to see if it had been loaded by the OS.


The partition is mounted at boot time, as asked by fstab on Debian:

Code:
/dev/sdb2        96M   35M   62M  37% /boot/efi


Code:
# /boot was on /dev/sdb11 during installation
UUID=30d970a9-3a7b-448d-922b-4ed2ddfec145 /boot           ext2    defaults        0       2
# /boot/efi was on /dev/sdb2 during installation
UUID=569B-9899  /boot/efi       vfat    umask=0077      0       1


As we can see, during /boot and /boot/efi (ESP partition) where pointed, I did not modified anything after that for these.

pc_users4 wrote:
Potentially, you need to make sure to unmount the ESP after booting into both Debian and Gentoo separately, where you can then find if there are files within /boot or /boot/efi which are actually on the / partition, then remove the contents of those directories if this is the case. Then you would mount the real ESP (which contains the folders 'debian' and 'Microsoft') and re-run the grub-install. Hopefully, after doing this on both Linux installs, you have a Grub menu for Gentoo, Debian and Windows.


I don't get this: I should unmount on Debian and Gentoo the ESP (aka /boot/efi on Debian) after each boot ? What is the purposes ?

Do you mean that the /boot partition into Debian is plain wrong and should probably removes it ?

pc_users4 wrote:
If you use systemd, I would recommend systemd-boot over grub, there is much less that can go wrong - if you are on OpenRC this is obviously not an option. I feel that maybe systemd-boot adoption is sparse in the Gentoo community so if a guide would be helpful, I could write one.


Could be a good idea, but for now I would really like to keep this on GRUB from Debian.

pc_users4 wrote:
edit:
I've seen that you have two boot partitions
Code:
/dev/sda2    1085440   1290239    204800   100M EFI System
/dev/sda7  281970688 283924479   1953792   954M BIOS boot


Likely /dev/sda7 "BIOS boot" is not needed. I don't see it in your fstab? I'm not sure that it's doing anything.


You mean is not needed because there is the EFI System partition ?

I'll definitly read more about ESP partition, I'm outdated on that and it brings problem.

Beside, thanks for your reply, if you can explains a little bit more where I asked question, would help me understand where I'm wrong.

Regards,
GASPARD DE RENEFORT Kévin
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sMueggli
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PostPosted: Tue Sep 19, 2023 10:00 am    Post subject: Reply with quote

Please boot Debian and show the entire /boot/grub/grub.cfg and /etc/default/grub.
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PostPosted: Tue Sep 19, 2023 10:12 am    Post subject: Reply with quote

pc_user4,

The bios_boot partition is used by grub when BIOS booting and GPT are in use.
That's a combination that is not supported everywhere. That's the only time its required.

A 2M bios_boot is adequate, if its needed at all. Grub uses it raw. It does not have a filesystem and it does not belong to the user.

With BIOS booting, the first stage of the boot loader is the the MBR, in LBA 0. The next part follows, in the free space before the first partition when BIOS is in use.
When GPT is in use, the GPT starts at LBA 1, so that space is not available. Grub uses the bios_boot partition instead.

With EFI booting, the firmware loads an EFI compliant program from the ESP. There is no part of the boot loader outside of any filesystem.
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PostPosted: Tue Sep 19, 2023 10:15 am    Post subject: Reply with quote

sMueggli wrote:
Please boot Debian and show the entire /boot/grub/grub.cfg and /etc/default/grub.


Code:
[12:02:03]
[Kernel: 6.1.0-12-amd64 - Debian: 12.1]
[root]@[Desktop] [~]
# cat /boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}
function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_gpt
insmod ext2
set root='hd1,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt8 --hint-efi=hd1,gpt8 --hint-baremetal=ahci1,gpt8  0c3d2680-2c69-42aa-874a-8c1ba2416b44
else
  search --no-floppy --fs-uuid --set=root 0c3d2680-2c69-42aa-874a-8c1ba2416b44
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=1920x1080
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
  set timeout=30
else
  if [ x$feature_timeout_style = xy ] ; then
    set timeout_style=menu
    set timeout=5
  # Fallback normal timeout code in case the timeout_style feature is
  # unavailable.
  else
    set timeout=5
  fi
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
insmod part_gpt
insmod ext2
set root='hd1,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt8 --hint-efi=hd1,gpt8 --hint-baremetal=ahci1,gpt8  0c3d2680-2c69-42aa-874a-8c1ba2416b44
else
  search --no-floppy --fs-uuid --set=root 0c3d2680-2c69-42aa-874a-8c1ba2416b44
fi
insmod png
if background_image /usr/share/desktop-base/emerald-theme/grub/grub-16x9.png; then
  set color_normal=white/black
  set color_highlight=black/white
else
  set menu_color_normal=cyan/blue
  set menu_color_highlight=white/blue
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
   set gfxpayload="${1}"
}
set linux_gfx_mode=
export linux_gfx_mode
menuentry 'Debian GNU/Linux' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-0c3d2680-2c69-42aa-874a-8c1ba2416b44' {
   load_video
   insmod gzio
   if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
   insmod part_gpt
   insmod ext2
   set root='hd1,gpt11'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt11 --hint-efi=hd1,gpt11 --hint-baremetal=ahci1,gpt11  30d970a9-3a7b-448d-922b-4ed2ddfec145
   else
     search --no-floppy --fs-uuid --set=root 30d970a9-3a7b-448d-922b-4ed2ddfec145
   fi
   echo   'Loading Linux 6.1.0-12-amd64 ...'
   linux   /vmlinuz-6.1.0-12-amd64 root=UUID=0c3d2680-2c69-42aa-874a-8c1ba2416b44 ro  quiet
   echo   'Loading initial ramdisk ...'
   initrd   /initrd.img-6.1.0-12-amd64
}
submenu 'Advanced options for Debian GNU/Linux' $menuentry_id_option 'gnulinux-advanced-0c3d2680-2c69-42aa-874a-8c1ba2416b44' {
   menuentry 'Debian GNU/Linux, with Linux 6.1.0-12-amd64' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.1.0-12-amd64-advanced-0c3d2680-2c69-42aa-874a-8c1ba2416b44' {
      load_video
      insmod gzio
      if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
      insmod part_gpt
      insmod ext2
      set root='hd1,gpt11'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt11 --hint-efi=hd1,gpt11 --hint-baremetal=ahci1,gpt11  30d970a9-3a7b-448d-922b-4ed2ddfec145
      else
        search --no-floppy --fs-uuid --set=root 30d970a9-3a7b-448d-922b-4ed2ddfec145
      fi
      echo   'Loading Linux 6.1.0-12-amd64 ...'
      linux   /vmlinuz-6.1.0-12-amd64 root=UUID=0c3d2680-2c69-42aa-874a-8c1ba2416b44 ro  quiet
      echo   'Loading initial ramdisk ...'
      initrd   /initrd.img-6.1.0-12-amd64
   }
   menuentry 'Debian GNU/Linux, with Linux 6.1.0-12-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.1.0-12-amd64-recovery-0c3d2680-2c69-42aa-874a-8c1ba2416b44' {
      load_video
      insmod gzio
      if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
      insmod part_gpt
      insmod ext2
      set root='hd1,gpt11'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt11 --hint-efi=hd1,gpt11 --hint-baremetal=ahci1,gpt11  30d970a9-3a7b-448d-922b-4ed2ddfec145
      else
        search --no-floppy --fs-uuid --set=root 30d970a9-3a7b-448d-922b-4ed2ddfec145
      fi
      echo   'Loading Linux 6.1.0-12-amd64 ...'
      linux   /vmlinuz-6.1.0-12-amd64 root=UUID=0c3d2680-2c69-42aa-874a-8c1ba2416b44 ro single
      echo   'Loading initial ramdisk ...'
      initrd   /initrd.img-6.1.0-12-amd64
   }
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows Boot Manager (on /dev/sdb2)' --class windows --class os $menuentry_id_option 'osprober-efi-569B-9899' {
   insmod part_gpt
   insmod fat
   set root='hd1,gpt2'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt2 --hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2  569B-9899
   else
     search --no-floppy --fs-uuid --set=root 569B-9899
   fi
   chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
   fwsetup
}
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/35_fwupd ###
### END /etc/grub.d/35_fwupd ###

### BEGIN /etc/grub.d/40_custom ###
# 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.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg
fi
### END /etc/grub.d/41_custom ###


Code:
[12:13:58]
[Kernel: 6.1.0-12-amd64 - Debian: 12.1]
[root]@[Desktop] [~]
# cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX=""

# If your computer has multiple operating systems installed, then you
# probably want to run os-prober. However, if your computer is a host
# for guest OSes installed via LVM or raw disk devices, running
# os-prober can cause damage to those guest OSes as it mounts
# filesystems to look for things.
GRUB_DISABLE_OS_PROBER=false

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE=1920x1080

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

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sMueggli
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Joined: 03 Sep 2022
Posts: 503

PostPosted: Tue Sep 19, 2023 12:45 pm    Post subject: Reply with quote

Please make sure you have installed the package "lvm2" on Debian.

Then mount the partition which contains the /boot directory of Gentoo and rerun "sudo update-grub" and also "sudo os-prober". Share the input and output of the executed commands.

EDIT: And please show also from Debian:
Code:
echo "$(LVM_SUPPRESS_FD_WARNINGS=1 lvs --noheadings --separator : -o vg_name,lv_name | sed "s|-|--|g;s|^[[:space:]]*\(.*\):\(.*\)$|/dev/mapper/\1-\2|")"
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