Bug#1106034: grub-common: In the GRUB boot menu, "GNU/Linux" repeats twice after the word "Debian"

[A. Ismail]

Package: grub-common
Version: 2.12-7
Severity: minor
X-Debbugs-Cc: a.h.ismail.dev at gmail.com

Dear Maintainer,

Since the upgrade from bookworm to sid, I noticed that on the boot menu
Debian's boot entry has duplicate "GNU/Linux" so it ends up as "Debian
GNU/Linux GNU/Linux".

I chased down the source of the issue and found this commit:
https://salsa.debian.org/grub-
team/grub/-/commit/372c8ce2b653b0edf7bcb197e216bf1bd403446a

This commit replaced the lsb_release method by sourcing the /etc/os-release
file. As a side effect, GRUB_DISTRIBUTOR changed from "Debian" to "Debian
GNU/Linux".

A snippet of the script in /etc/grub.d/10_linux indicates that the script will
add GNU/Linux to the OS name if it isn't Ubuntu or Kubuntu.

See the snippets below:
------
from /etc/grub.d/10_linux:

  case ${GRUB_DISTRIBUTOR} in
    Ubuntu|Kubuntu)
      OS="${GRUB_DISTRIBUTOR}"
      ;;
    *)
      OS="${GRUB_DISTRIBUTOR} GNU/Linux"
      ;;
  esac


from /etc/grub.d/20_linux_xen:

if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
  OS=GNU/Linux
else
  OS="${GRUB_DISTRIBUTOR} GNU/Linux"
  CLASS="--class $(echo ${GRUB_DISTRIBUTOR} | tr 'A-Z' 'a-z' | cut -d' '
-f1|LC_ALL=C sed 's,[^[:alnum:]_],_,g') ${CLASS}"
fi

from /boot/grub/grub.cfg:

menuentry 'Debian GNU/Linux GNU/Linux' --class debian --class gnu-linux --class
gnu --class os $menuentry_id_option 'gnulinux-simple-<...>' {
        load_video
        insmod gzio
        if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
        insmod part_gpt
        insmod ext2
        search --no-floppy --fs-uuid --set=root <...>
        echo    'Loading Linux 6.12.27-amd64 ...'
        linux   /vmlinuz-6.12.27-amd64 root=UUID=<...> ro
rootflags=subvol=<...>  splash
        echo    'Loading initial ramdisk ...'
        initrd  /initrd.img-6.12.27-amd64
}

------

Thank you


-- Package-specific info:

*********************** BEGIN /proc/mounts
/dev/mapper/nvme0n1p3_crypt / btrfs rw,relatime,compress-force=zstd:3,ssd,discard=async,space_cache=v2,subvolid=774,subvol=/root 0 0
/dev/mapper/nvme0n1p3_crypt /home btrfs rw,relatime,compress-force=zstd:3,ssd,discard=async,space_cache=v2,subvolid=734,subvol=/home 0 0
/dev/nvme0n1p2 /boot ext4 rw,relatime 0 0
/dev/nvme0n1p1 /boot/efi vfat rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro 0 0
*********************** END /proc/mounts

*********************** BEGIN /boot/grub/grub.cfg

-- System Information:
Debian Release: 13.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.27-amd64 (SMP w/16 CPU threads; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages grub-common depends on:
ii  gettext-base        0.23.1-2
ii  libc6               2.41-8
ii  libdevmapper1.02.1  2:1.02.205-2
ii  libefiboot1t64      38-3.1+b1
ii  libefivar1t64       38-3.1+b1
ii  libfreetype6        2.13.3+dfsg-1
ii  libfuse3-4          3.17.2-1
ii  liblzma5            5.8.1-1

Versions of packages grub-common recommends:
ii  os-prober  1.83

Versions of packages grub-common suggests:
ii  console-setup  1.237
ii  desktop-base   13.0.2
pn  grub-emu       <none>
ii  mtools         4.0.48-1
pn  multiboot-doc  <none>
ii  xorriso        1.5.6-1.2+b1

-- no debconf information