Comment # 14 on bug 1130669 from Alexandre Pereira

Noice :)

Seems to be fixed, I updated the package and tried linux-boot-prober command
directly and grub-mkconfig. Neither deleted root files :P

Now the issue is that grub-mkconfig isn't creating the other linux's grub menu
configuration. They are detected, but the grub.cfg section of 30-os-prober is
empty.

log of grub-mkconfig:


tumbleweed:~ # grub2-mkconfig
Generating grub configuration file ...
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set btrfs_relative_path="y"
export btrfs_relative_path
if [ -f ${config_directory}/grubenv ]; then
  load_env -f ${config_directory}/grubenv
elif [ -s $prefix/grubenv ]; then
  load_env
fi

if [ "${env_block}" ] ; then
  load_env -f "${env_block}"
fi

if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   if [ "${env_block}" ] ; then
     save_env -f "${env_block}" next_entry
   fi
   set boot_once=true
else
   set default="${saved_entry}"
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
    if [ "${env_block}" ] ; then
      save_env -f "${env_block}" saved_entry
    fi

  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$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_gpt
insmod btrfs
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root  11e10d04-c4ec-4292-9357-1be7a9b8b3ae
else
  search --no-floppy --fs-uuid --set=root 11e10d04-c4ec-4292-9357-1be7a9b8b3ae
fi
    font="/usr/share/grub2/unicode.pf2"
fi

if loadfont $font ; then
echo "Please press t to show the boot menu on this console"
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=pt_PT
  insmod gettext
fi
terminal_output gfxterm
Found theme: /boot/grub2/themes/openSUSE/theme.txt
insmod part_gpt
insmod ext2
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root  5a612db9-3894-42ba-b598-f4270842077b
else
  search --no-floppy --fs-uuid --set=root 5a612db9-3894-42ba-b598-f4270842077b
fi
insmod gfxmenu
loadfont ($root)/grub2/themes/openSUSE/ascii.pf2
loadfont ($root)/grub2/themes/openSUSE/DejaVuSans10.pf2
loadfont ($root)/grub2/themes/openSUSE/DejaVuSans12.pf2
loadfont ($root)/grub2/themes/openSUSE/DejaVuSans-Bold14.pf2
insmod png
set theme=($root)/grub2/themes/openSUSE/theme.txt
export theme
if [ x${boot_once} = xtrue ]; then
  set timeout=0
elif [ x$feature_timeout_style = xy ] ; then
  set timeout_style=countdown
  set timeout=1
# Fallback hidden-timeout code in case the timeout_style feature is
# unavailable.
elif sleep --verbose --interruptible 1 ; then
  set timeout=0
fi
if [ -n "$extra_cmdline" ]; then
  menuentry "Help on bootable snapshot #$snapshot_num" {
    echo "Select the default entry of the snapshot boot menu."
    echo "Examine the snapshot, and if it's OK,"
    echo "   run 'snapper rollback' and reboot."
    echo "See 'System Rollback by Booting from Snapshots'"
    echo "   in the manual for more information."
    echo "  ** Hit Any Key to return to boot menu **  "
    read
  }
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/00_tuned ###
set tuned_params=""
set tuned_initrd=""
### END /etc/grub.d/00_tuned ###

### BEGIN /etc/grub.d/10_linux ###
Found linux image: /boot/vmlinuz-5.0.7-1-default
Found initrd image: /boot/initrd-5.0.7-1-default
menuentry 'openSUSE Tumbleweed'  --class opensuse --class gnu-linux --class gnu
--class os $menuentry_id_option
'gnulinux-simple-11e10d04-c4ec-4292-9357-1be7a9b8b3ae' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod ext2
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root 
5a612db9-3894-42ba-b598-f4270842077b
        else
          search --no-floppy --fs-uuid --set=root
5a612db9-3894-42ba-b598-f4270842077b
        fi
        echo    'Loading Linux 5.0.7-1-default ...'
        linuxefi /vmlinuz-5.0.7-1-default
root=UUID=11e10d04-c4ec-4292-9357-1be7a9b8b3ae  ${extra_cmdline} quiet splash
rootflags=subvol=/@opensuse/@root radeon.cik_support=0 radeon.si_support=0
amdgpu.dpm=0 amdgpu.dc=0 amdgpu.si_support=1 amdgpu.cik_support=1
spectre_v2=retpoline,generic
        echo    'Loading initial ramdisk ...'
        initrdefi /initrd-5.0.7-1-default
}
submenu 'Advanced options for openSUSE Tumbleweed' --hotkey=1
$menuentry_id_option 'gnulinux-advanced-11e10d04-c4ec-4292-9357-1be7a9b8b3ae' {
        menuentry 'openSUSE Tumbleweed, with Linux 5.0.7-1-default' --hotkey=2
--class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option
'gnulinux-5.0.7-1-default-advanced-11e10d04-c4ec-4292-9357-1be7a9b8b3ae' {
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod ext2
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root 
5a612db9-3894-42ba-b598-f4270842077b
                else
                  search --no-floppy --fs-uuid --set=root
5a612db9-3894-42ba-b598-f4270842077b
                fi
                echo    'Loading Linux 5.0.7-1-default ...'
                linuxefi /vmlinuz-5.0.7-1-default
root=UUID=11e10d04-c4ec-4292-9357-1be7a9b8b3ae  ${extra_cmdline} quiet splash
rootflags=subvol=/@opensuse/@root radeon.cik_support=0 radeon.si_support=0
amdgpu.dpm=0 amdgpu.dc=0 amdgpu.si_support=1 amdgpu.cik_support=1
spectre_v2=retpoline,generic
                echo    'Loading initial ramdisk ...'
                initrdefi /initrd-5.0.7-1-default
        }
}

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

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

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

### BEGIN /etc/grub.d/20_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
Found openSUSE Tumbleweed on /dev/sda3

Found Manjaro Linux on /dev/sda3

Found Calculate/Linux on /dev/sda3

### END /etc/grub.d/30_os-prober ###

### 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.

menuentry 'Windows Boot Manager (on /dev/sda1)' --class windows --class os
$menuentry_id_option 'osprober-efi-4E72-5A41' {
        insmod part_gpt
        insmod fat
        set root='hd0,gpt1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1
--hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  4E72-5A41
        else
          search --no-floppy --fs-uuid --set=root 4E72-5A41
        fi
        chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

### 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 ###

### BEGIN /etc/grub.d/80_suse_btrfs_snapshot ###
### END /etc/grub.d/80_suse_btrfs_snapshot ###

### BEGIN /etc/grub.d/90_persistent ###
### END /etc/grub.d/90_persistent ###

### BEGIN /etc/grub.d/95_textmode ###

    # On EFI systems we can only have graphics *or* serial, so allow the user
    # to switch between the two
    hiddenentry 'Text mode' --hotkey 't' {
        set textmode=true
        terminal_output console
    }
### END /etc/grub.d/95_textmode ###
done
tumbleweed:~ # 


Thanks :)