[Solved]Grub-Can't find other operating system

[pottzie]

Let me first say that I've just installed Mint 14, and it kicks butt! Awesome, and the install was flawless-something that hasn't happened in a while for me, unfortunately. Glad to see someone sweated the small stuff, everything works without a hitch. Now I can start installing Linux on friend's computers without having to worry about a lot of weird stuff happening, and believe me, there's been plenty of weirdness lately, on all fronts with systemd, gnome, kernel foo-boos and whatnot. Glad to see something "just working," and if there's anything I want to "just work," it's Mint! Let the others re-invent the wheel every ten minutes, but leave Mint alone, dammit. Hats off to Clem and crew. Someone owes them a beer. Lots of beers. Beers with beers in their beers.

Now for what I'm trying to do. Simple, enough, I've got Fedora on another hard drive, and after installing Mint, I ran "grub-mkconfig -o /boot/grub/grub.cfg," hoping to get grub to see Fedora and all would be good. That didn't work. I seem to remember a program called (something like...) osfinder, but Google and Synaptic didn't show anything by that name. Is there such a critter, or am I hallucinating. And if I am hallucinating, give me a bit, I want to enjoy it.

I know that grub used to have a problem finding ext4 file systems, but I though that had been fixed. Don't know if that's what I'm dealing with, but how do I get grub to find Fedora?

Thanks.

[xenopeek]

os-prober. If that doesn't work, please follow the steps here and share the output of that for more pointed help: viewtopic.php?f=46&t=104957&p=592874#p592970

[xenopeek]

Code: Select all


============================= Boot Info Summary: ===============================

 => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of
    the same hard drive for core.img. core.img is at this location and looks
    in partition 72 for .
 => Grub2 (v1.99) is installed in the MBR of /dev/sdb and looks at sector 1 of
    the same hard drive for core.img. core.img is at this location and looks
    in partition 99 for .

sda1: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info:
    Operating System:  Linux Mint 14 Nadia
    Boot files:        /boot/grub/grub.cfg /etc/fstab

sda2: __________________________________________________________________________

    File system:       Extended Partition
    Boot sector type:  -
    Boot sector info:

sda5: __________________________________________________________________________

    File system:       swap
    Boot sector type:  -
    Boot sector info:

sdb1: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info:
    Operating System: 
    Boot files:        /grub2/grub.cfg

sdb2: __________________________________________________________________________

    File system:       LVM2_member
    Boot sector type:  -
    Boot sector info:

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________

Disk /dev/sda: 30.0 GB, 30020272128 bytes
255 heads, 63 sectors/track, 3649 cylinders, total 58633344 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sda1    *             63    57,576,959    57,576,897  83 Linux
/dev/sda2          57,576,960    58,621,184     1,044,225   5 Extended
/dev/sda5          57,577,023    58,621,184     1,044,162  82 Linux swap / Solaris


Drive: sdb _____________________________________________________________________

Disk /dev/sdb: 30.0 GB, 30020272128 bytes
255 heads, 63 sectors/track, 3649 cylinders, total 58633344 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

Partition  Boot  Start Sector    End Sector  # of Sectors  Id System

/dev/sdb1    *          2,048     1,026,047     1,024,000  83 Linux
/dev/sdb2           1,026,048    58,632,191    57,606,144  8e Linux LVM


"blkid" output: ________________________________________________________________

Device           UUID                                   TYPE       LABEL

/dev/sda1        cc5b70ec-5a77-45d7-a144-6406038f0fea   ext4       
/dev/sda5        12b6f3b5-5886-417d-8b3d-c85cf682be59   swap       
/dev/sdb1        db0215e1-d48a-4b11-becb-83af3ce4e289   ext4       
/dev/sdb2        UbBUTl-Jiss-Lv8u-oqxk-gAR8-Un49-5bUtTM LVM2_member

================================ Mount points: =================================

Device           Mount_Point              Type       Options

/dev/sda1        /                        ext4       (rw,errors=remount-ro)


=========================== sda1/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
set default="0"

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 recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; 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$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  cc5b70ec-5a77-45d7-a144-6406038f0fea
else
  search --no-floppy --fs-uuid --set=root cc5b70ec-5a77-45d7-a144-6406038f0fea
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/06_mint_theme ###
set menu_color_normal=white/black
set menu_color_highlight=white/light-gray
### END /etc/grub.d/06_mint_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
   set gfxpayload="$1"
   if [ "$1" = "keep" ]; then
      set vt_handoff=vt.handoff=7
   else
      set vt_handoff=
   fi
}
if [ ${recordfail} != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Linux Mint 14 Cinnamon 32-bit, 3.5.0-17-generic (/dev/sda1)' --class linuxmint --class gnu-linux --class gnu --class os {
   recordfail
   gfxmode $linux_gfx_mode
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='hd0,msdos1'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  cc5b70ec-5a77-45d7-a144-6406038f0fea
   else
     search --no-floppy --fs-uuid --set=root cc5b70ec-5a77-45d7-a144-6406038f0fea
   fi
   linux   /boot/vmlinuz-3.5.0-17-generic root=UUID=cc5b70ec-5a77-45d7-a144-6406038f0fea ro   quiet splash $vt_handoff
   initrd   /boot/initrd.img-3.5.0-17-generic
}
menuentry 'Linux Mint 14 Cinnamon 32-bit, 3.5.0-17-generic (/dev/sda1) -- recovery mode' --class linuxmint --class gnu-linux --class gnu --class os {
   recordfail
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='hd0,msdos1'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  cc5b70ec-5a77-45d7-a144-6406038f0fea
   else
     search --no-floppy --fs-uuid --set=root cc5b70ec-5a77-45d7-a144-6406038f0fea
   fi
   echo   'Loading Linux 3.5.0-17-generic ...'
   linux   /boot/vmlinuz-3.5.0-17-generic root=UUID=cc5b70ec-5a77-45d7-a144-6406038f0fea ro recovery nomodeset
   echo   'Loading initial ramdisk ...'
   initrd   /boot/initrd.img-3.5.0-17-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/10_lupin ###
### END /etc/grub.d/10_lupin ###

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

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

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
   insmod part_msdos
   insmod ext2
   set root='hd0,msdos1'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  cc5b70ec-5a77-45d7-a144-6406038f0fea
   else
     search --no-floppy --fs-uuid --set=root cc5b70ec-5a77-45d7-a144-6406038f0fea
   fi
   linux16   /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
   insmod part_msdos
   insmod ext2
   set root='hd0,msdos1'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  cc5b70ec-5a77-45d7-a144-6406038f0fea
   else
     search --no-floppy --fs-uuid --set=root cc5b70ec-5a77-45d7-a144-6406038f0fea
   fi
   linux16   /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
if [ "x${timeout}" != "x-1" ]; then
  if keystatus; then
    if keystatus --shift; then
      set timeout=-1
    else
      set timeout=0
    fi
  else
    if sleep --interruptible 3 ; then
      set timeout=0
    fi
  fi
fi
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###

### 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 ###
--------------------------------------------------------------------------------

=============================== sda1/etc/fstab: ================================

--------------------------------------------------------------------------------
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/sda1 during installation
UUID=cc5b70ec-5a77-45d7-a144-6406038f0fea /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda5 during installation
UUID=12b6f3b5-5886-417d-8b3d-c85cf682be59 none            swap    sw              0       0
/dev/fd0        /media/floppy0  auto    rw,user,noauto,exec,utf8 0       0
--------------------------------------------------------------------------------

=================== sda1: Location of files loaded by Grub: ====================

           GiB - GB             File                                 Fragment(s)

  10.200232983 = 10.952416768   boot/grub/grub.cfg                             1
   1.560935497 = 1.676041728    boot/initrd.img-3.5.0-17-generic               1
   0.799769878 = 0.858746368    boot/vmlinuz-3.5.0-17-generic                  1
   1.560935497 = 1.676041728    initrd.img                                     1
   1.560935497 = 1.676041728    initrd.img.old                                 1
   0.799769878 = 0.858746368    vmlinuz                                        1

============================= sdb1/grub2/grub.cfg: =============================

--------------------------------------------------------------------------------
#
# 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 ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="0"

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$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod lvm
insmod ext2
set root='lvm/vg_upstairsbox-lv_root'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint='lvm/vg_upstairsbox-lv_root'  45bc1041-bc4c-4a4e-a6cb-df64049c22cd
else
  search --no-floppy --fs-uuid --set=root 45bc1041-bc4c-4a4e-a6cb-df64049c22cd
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Fedora (3.6.7-4.fc17.i686)' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-45bc1041-bc4c-4a4e-a6cb-df64049c22cd' {
   load_video
   set gfxpayload=keep
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='hd0,msdos1'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  db0215e1-d48a-4b11-becb-83af3ce4e289
   else
     search --no-floppy --fs-uuid --set=root db0215e1-d48a-4b11-becb-83af3ce4e289
   fi
   echo 'Loading Fedora (3.6.7-4.fc17.i686)'
   linux   /vmlinuz-3.6.7-4.fc17.i686 root=/dev/mapper/vg_upstairsbox-lv_root ro rd.md=0 rd.dm=0 rd.lvm.lv=vg_upstairsbox/lv_swap  KEYTABLE=us rd.lvm.lv=vg_upstairsbox/lv_root rd.luks=0 SYSFONT=True LANG=en_US.UTF-8 rhgb quiet
   echo 'Loading initial ramdisk ...'
   initrd /initramfs-3.6.7-4.fc17.i686.img
}
menuentry 'Fedora' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-45bc1041-bc4c-4a4e-a6cb-df64049c22cd' {
   load_video
   set gfxpayload=keep
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='hd0,msdos1'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  db0215e1-d48a-4b11-becb-83af3ce4e289
   else
     search --no-floppy --fs-uuid --set=root db0215e1-d48a-4b11-becb-83af3ce4e289
   fi
   echo   'Loading Linux 3.6.6-1.fc17.i686 ...'
   linux   /vmlinuz-3.6.6-1.fc17.i686 root=/dev/mapper/vg_upstairsbox-lv_root ro rd.md=0 rd.dm=0 rd.lvm.lv=vg_upstairsbox/lv_swap  KEYTABLE=us rd.lvm.lv=vg_upstairsbox/lv_root rd.luks=0 SYSFONT=True LANG=en_US.UTF-8 rhgb quiet
   echo   'Loading initial ramdisk ...'
   initrd   /initramfs-3.6.6-1.fc17.i686.img
}
submenu 'Advanced options for Fedora' $menuentry_id_option 'gnulinux-advanced-45bc1041-bc4c-4a4e-a6cb-df64049c22cd' {
   menuentry 'Fedora, with Linux 3.6.6-1.fc17.i686' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.6.6-1.fc17.i686-advanced-45bc1041-bc4c-4a4e-a6cb-df64049c22cd' {
      load_video
      set gfxpayload=keep
      insmod gzio
      insmod part_msdos
      insmod ext2
      set root='hd0,msdos1'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  db0215e1-d48a-4b11-becb-83af3ce4e289
      else
        search --no-floppy --fs-uuid --set=root db0215e1-d48a-4b11-becb-83af3ce4e289
      fi
      echo   'Loading Linux 3.6.6-1.fc17.i686 ...'
      linux   /vmlinuz-3.6.6-1.fc17.i686 root=/dev/mapper/vg_upstairsbox-lv_root ro rd.md=0 rd.dm=0 rd.lvm.lv=vg_upstairsbox/lv_swap  KEYTABLE=us rd.lvm.lv=vg_upstairsbox/lv_root rd.luks=0 SYSFONT=True LANG=en_US.UTF-8 rhgb quiet
      echo   'Loading initial ramdisk ...'
      initrd   /initramfs-3.6.6-1.fc17.i686.img
   }
   menuentry 'Fedora, with Linux 3.6.6-1.fc17.i686 (recovery mode)' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.6.6-1.fc17.i686-recovery-45bc1041-bc4c-4a4e-a6cb-df64049c22cd' {
      load_video
      set gfxpayload=keep
      insmod gzio
      insmod part_msdos
      insmod ext2
      set root='hd0,msdos1'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  db0215e1-d48a-4b11-becb-83af3ce4e289
      else
        search --no-floppy --fs-uuid --set=root db0215e1-d48a-4b11-becb-83af3ce4e289
      fi
      echo   'Loading Linux 3.6.6-1.fc17.i686 ...'
      linux   /vmlinuz-3.6.6-1.fc17.i686 root=/dev/mapper/vg_upstairsbox-lv_root ro single rd.md=0 rd.dm=0 rd.lvm.lv=vg_upstairsbox/lv_swap  KEYTABLE=us rd.lvm.lv=vg_upstairsbox/lv_root rd.luks=0 SYSFONT=True LANG=en_US.UTF-8 rhgb quiet
      echo   'Loading initial ramdisk ...'
      initrd   /initramfs-3.6.6-1.fc17.i686.img
   }
   menuentry 'Fedora, with Linux 3.3.4-5.fc17.i686' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.3.4-5.fc17.i686-advanced-45bc1041-bc4c-4a4e-a6cb-df64049c22cd' {
      load_video
      set gfxpayload=keep
      insmod gzio
      insmod part_msdos
      insmod ext2
      set root='hd0,msdos1'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  db0215e1-d48a-4b11-becb-83af3ce4e289
      else
        search --no-floppy --fs-uuid --set=root db0215e1-d48a-4b11-becb-83af3ce4e289
      fi
      echo   'Loading Linux 3.3.4-5.fc17.i686 ...'
      linux   /vmlinuz-3.3.4-5.fc17.i686 root=/dev/mapper/vg_upstairsbox-lv_root ro rd.md=0 rd.dm=0 rd.lvm.lv=vg_upstairsbox/lv_swap  KEYTABLE=us rd.lvm.lv=vg_upstairsbox/lv_root rd.luks=0 SYSFONT=True LANG=en_US.UTF-8 rhgb quiet
      echo   'Loading initial ramdisk ...'
      initrd   /initramfs-3.3.4-5.fc17.i686.img
   }
   menuentry 'Fedora, with Linux 3.3.4-5.fc17.i686 (recovery mode)' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.3.4-5.fc17.i686-recovery-45bc1041-bc4c-4a4e-a6cb-df64049c22cd' {
      load_video
      set gfxpayload=keep
      insmod gzio
      insmod part_msdos
      insmod ext2
      set root='hd0,msdos1'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  db0215e1-d48a-4b11-becb-83af3ce4e289
      else
        search --no-floppy --fs-uuid --set=root db0215e1-d48a-4b11-becb-83af3ce4e289
      fi
      echo   'Loading Linux 3.3.4-5.fc17.i686 ...'
      linux   /vmlinuz-3.3.4-5.fc17.i686 root=/dev/mapper/vg_upstairsbox-lv_root ro single rd.md=0 rd.dm=0 rd.lvm.lv=vg_upstairsbox/lv_swap  KEYTABLE=us rd.lvm.lv=vg_upstairsbox/lv_root rd.luks=0 SYSFONT=True LANG=en_US.UTF-8 rhgb quiet
      echo   'Loading initial ramdisk ...'
      initrd   /initramfs-3.3.4-5.fc17.i686.img
   }
}

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

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Slackware Linux (Slackware 14.0)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-a6fd1270-c832-4d65-9f40-0cb2bd8b3917' {
   insmod part_gpt
   insmod ext2
   set root='hd1,gpt1'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt1 --hint-efi=hd1,gpt1 --hint-baremetal=ahci1,gpt1  a6fd1270-c832-4d65-9f40-0cb2bd8b3917
   else
     search --no-floppy --fs-uuid --set=root a6fd1270-c832-4d65-9f40-0cb2bd8b3917
   fi
   linux /boot/vmlinuz root=/dev/sda1 ro  vt.default_utf8=0 vga = normal
}
submenu 'Advanced options for Slackware Linux (Slackware 14.0)' $menuentry_id_option 'osprober-gnulinux-advanced-a6fd1270-c832-4d65-9f40-0cb2bd8b3917' {
   menuentry 'Linux (on /dev/sdb1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz--a6fd1270-c832-4d65-9f40-0cb2bd8b3917' {
      insmod part_gpt
      insmod ext2
      set root='hd1,gpt1'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt1 --hint-efi=hd1,gpt1 --hint-baremetal=ahci1,gpt1  a6fd1270-c832-4d65-9f40-0cb2bd8b3917
      else
        search --no-floppy --fs-uuid --set=root a6fd1270-c832-4d65-9f40-0cb2bd8b3917
      fi
      linux /boot/vmlinuz root=/dev/sda1 ro  vt.default_utf8=0 vga = normal
   }
}

### 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.
### 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 ###
--------------------------------------------------------------------------------

=================== sdb1: Location of files loaded by Grub: ====================

           GiB - GB             File                                 Fragment(s)

   0.024920464 = 0.026758144    grub2/grub.cfg                                 2
   0.039919853 = 0.042863616    initramfs-3.3.4-5.fc17.i686.img                4
   0.075786591 = 0.081375232    initramfs-3.6.6-1.fc17.i686.img                5
   0.101252556 = 0.108719104    initramfs-3.6.7-4.fc17.i686.img                4
   0.020897865 = 0.022438912    vmlinuz-3.3.4-5.fc17.i686                      1
   0.052303314 = 0.056160256    vmlinuz-3.6.6-1.fc17.i686                      3
   0.083555222 = 0.089716736   


There's a mention of Slackware in the Fedora grub menu. I had Slackware on the hard drive that Mint is now on, and replaced Slackware with Mint.

[pottzie]

Got it! I tried coming at the problem from another angle, and unplugged the drive that Mint is on, and then booted into Fedora, and tried to get grub to "see" Mint from there. At first I was stumped, as Fedora's version of the grub update command ( grub2-mkconfig -o /boot/grub2/grub.cfg ) didn't find Mint any better than Mint could find Fedora. Then I found a post saying that I have to mount the drive that the operating system I'm trying to get grub to find is installed on. So I found the hard drive that I have Mint on and mounted it, and then ran the grub update command. Now I have Mint and Fedora showing in my grub menu when I start. Too simple, after I found what I was missing.