LinuxQuestions.org - memtest86+ missing from my boot grub menu!

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memtest86+ missing from my boot grub menu!

Hello.
I'm running Ubuntu 22.04 (recently upgraded) on

Code:

uname -a

Linux kinsella-OptiPlex-5060 5.15.0-48-generic #54-Ubuntu SMP Fri Aug 26 13:26:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

It is fully updated to Ubuntu 22.04.1 LTS

In the process of chasing a possible kernel problem on another thread I noticed that memtest86+ is missing from my boot grub menu.

(I had been advised to use it to check that I don't have a memory problem.
In my defence, I had't noticed as my system hasn't had any boot problems and the boot menu is "hidden".

Code:

$ grep hidden /etc/default/grub

GRUB_TIMEOUT_STYLE=hidden

)

I'd be very grateful for advice on:

How to restore memtest86+ to the boot grub menu
possible reasons why memtest86+ "disappeared" from the menu.

Interestingly, memtest86+ does appear in my boot folder:

Code:

$ ls /boot

config-5.15.0-47-generic      memtest86+.elf

config-5.15.0-48-generic      memtest86+_multiboot.bin

efi                          System.map-5.15.0-47-generic

grub                          System.map-5.15.0-48-generic

initrd.img                    vmlinuz

initrd.img-5.15.0-47-generic  vmlinuz-5.15.0-47-generic

initrd.img-5.15.0-48-generic  vmlinuz-5.15.0-48-generic

initrd.img.old                vmlinuz.old

memtest86+.bin

Thanks.

What is in your /etc/grub.d/? Is there a file for memtest86+?

Evo2.

Quote:

Originally Posted by evo2 (Post 6384597)

What is in your /etc/grub.d/? Is there a file for memtest86+?

Evo2.

Thanks.
See below:

Code:

$ ls -l /etc/grub.d

total 140

-rwxr-xr-x 1 root root 10627 Aug 17  2020 00_header

-rwxr-xr-x 1 root root  6260 Apr 15 22:50 05_debian_theme

-rwxr-xr-x 1 root root 18683 Apr 15 22:50 10_linux

-rwxr-xr-x 1 root root 43031 Apr 15 22:50 10_linux_zfs

-rwxr-xr-x 1 root root 14180 Apr 15 22:50 20_linux_xen

-rwxr-xr-x 1 root root  2924 Feb  6  2022 20_memtest86+

-rwxr-xr-x 1 root root 13369 Apr 15 22:50 30_os-prober

-rwxr-xr-x 1 root root  1372 Apr 15 22:50 30_uefi-firmware

-rwxr-xr-x 1 root root  700 Feb 21  2022 35_fwupd

-rwxr-xr-x 1 root root  214 Jul 17  2018 40_custom

-rwxr-xr-x 1 root root  215 Apr 15 22:50 41_custom

-rw-r--r-- 1 root root  483 Jul 17  2018 README

So no memtest86+ file just a 20_memtest86+ file whose contents are:

Code:

#!/bin/sh

set -e



if [ -f /usr/lib/grub/grub-mkconfig_lib ]; then

  . /usr/lib/grub/grub-mkconfig_lib

  LX=linux16

elif [ -f /usr/lib/grub/update-grub_lib ]; then

  . /usr/lib/grub/update-grub_lib

  LX=linux

else

  # no grub file, so we notify and exit gracefully

  echo "Cannot find grub config file, exiting." >&2

  exit 0

fi



# We need 16-bit boot, which isn't available on EFI.

if [ -d /sys/firmware/efi ]; then

  echo "Memtest86+ needs a 16-bit boot, that is not available on EFI, exiting" >&2

  exit 0

fi



if [ -f /etc/default/grub ]; then

  GRUB_DISABLE_MEMTEST=`sed -n 's/^GRUB_DISABLE_MEMTEST=\(.*\)/\1/p' < /etc/default/grub`

  GRUB_MEMTEST_DISABLE_SERIAL=`sed -n 's/^GRUB_MEMTEST_DISABLE_SERIAL=\(.*\)/\1/p' < /etc/default/grub`

  GRUB_MEMTEST_ENABLE_MULTIBOOT=`sed -n 's/^GRUB_MEMTEST_ENABLE_MULTIBOOT=\(.*\)/\1/p' < /etc/default/grub`

  GRUB_MEMTEST_SERIAL_PARAMS=`sed -n 's/^GRUB_MEMTEST_SERIAL_PARAMS=\(.*\)/\1/p' < /etc/default/grub`

fi



if [ "x${GRUB_MEMTEST_SERIAL_PARAMS}" = "x" ] ; then

  GRUB_MEMTEST_SERIAL_PARAMS="ttyS0,115200n8"

fi



# With GRUB_DISABLE_MEMTEST=true don't add memtest entries

if [ "x${GRUB_DISABLE_MEMTEST}" = "xtrue" ] ; then

  exit 0

fi



# We can't cope with loop-mounted devices here.

case ${GRUB_DEVICE_BOOT} in

  /dev/loop/*|/dev/loop[0-9]) exit 0 ;;

esac



export TEXTDOMAIN=memtest86+



prepare_boot_cache="$(prepare_grub_to_access_device ${GRUB_DEVICE_BOOT} | sed -e "s/^/\t/")"



if test -e /boot/memtest86+.elf ; then

  MEMTESTPATH=$( make_system_path_relative_to_its_root "/boot/memtest86+.elf" )

  echo "Found memtest86+ image: $MEMTESTPATH" >&2

  cat << EOF

menuentry '$(gettext_printf "Memory test (memtest86+.elf)")' {

EOF

  printf '%s\n' "${prepare_boot_cache}"

  cat << EOF

        knetbsd        $MEMTESTPATH

}

EOF

fi



if [ "x${GRUB_MEMTEST_DISABLE_SERIAL}" != "xtrue" -a -e /boot/memtest86+.bin ]; then

  MEMTESTPATH=$( make_system_path_relative_to_its_root "/boot/memtest86+.bin" )

  echo "Found memtest86+ image: $MEMTESTPATH" >&2

  cat << EOF

menuentry '$(gettext_printf "Memory test (memtest86+.bin, serial console)")' {

EOF

  printf '%s\n' "${prepare_boot_cache}"

  cat << EOF

        $LX        $MEMTESTPATH console=${GRUB_MEMTEST_SERIAL_PARAMS}

}

EOF

fi



if [ "x${GRUB_MEMTEST_ENABLE_MULTIBOOT}" = "xtrue" -a -e /boot/memtest86+_multiboot.bin ]; then

  MEMTESTPATH=$( make_system_path_relative_to_its_root "/boot/memtest86+_multiboot.bin" )

  echo "Found memtest86+ multiboot image: $MEMTESTPATH" >&2

  cat << EOF

menuentry '$(gettext_printf "Memory test (memtest86+, experimental multiboot)")' {

EOF

  printf '%s\n' "${prepare_boot_cache}"

  cat << EOF

        multiboot        $MEMTESTPATH

}

EOF

  if [ "x${GRUB_MEMTEST_DISABLE_SERIAL}" != "xtrue" ]; then

  cat << EOF

menuentry '$(gettext_printf "Memory test (memtest86+, serial console, experimental multiboot)")' {

EOF

  printf '%s\n' "${prepare_boot_cache}"

  cat << EOF

        multiboot        $MEMTESTPATH console=${GRUB_MEMTEST_SERIAL_PARAMS}

}

EOF

  fi

fi

Hi,

ok, so it seems memtest86+ is installed, but seems not to be configured properly. As part of the postinstall update-grub should be run which among other things will use /etc/grub.d/20_memtest86+ (and other files) to populate /boot/grub/grub.cfg. Does your /boot/grub/grub.cfg contain memtest86+ entries?

If not. You may be able to just run update-grub to generate them. However, I wonder why they are missing. I'd suggest checking the state of your memtest86+ package. Eg

Code:

dpkg -l memtest86+

Evo2.

post the output of

Code:

ls -l /etc/grub.d/20_memtest86+

Quote:

Originally Posted by evo2 (Post 6384789)

Code:

dpkg -l memtest86+

Evo2.

Thanks.
Here you go:

Code:

$ dpkg -l memtest86+

Desired=Unknown/Install/Remove/Purge/Hold

| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend

|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)

||/ Name          Version      Architecture Description

+++-==============-============-============-=================================

ii  memtest86+    5.31b+dfsg-4 amd64        thorough real-mode memory tester

Quote:

Originally Posted by colorpurple21859 (Post 6384794)

post the output of

Code:

ls -l /etc/grub.d/20_memtest86+

Thanks, here it is:

Code:

$ ls -l /etc/grub.d/20_memtest86+

-rwxr-xr-x 1 root root 2924 Feb  6  2022 /etc/grub.d/20_memtest86+

Post the contents of /etc/default/grub

Quote:

Originally Posted by colorpurple21859 (Post 6384875)

Post the contents of /etc/default/grub

Ok here you go:

Code:

$ cat /etc/default/grub

Code:

# 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_STYLE=hidden

GRUB_TIMEOUT=10

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

# GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.dc=1 nomodeset"

GRUB_CMDLINE_LINUX=""



# 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-pc only)

#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=640x480



# 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"



# amdgpu.si_support=1

# amdgpu.cik_support=1

#amdgpu.dc=1

# amdgpu.dpm=1

Quote:

Originally Posted by colorpurple21859 (Post 6384901)

Maybe this will help:
https://www.yosoygames.com.ar/wp/202...-grub2-ubuntu/

Thanks.

I'll try over the weekend..

Quote:

Originally Posted by jkcray (Post 6384847)

Code:

$ dpkg -l memtest86+

Desired=Unknown/Install/Remove/Purge/Hold

| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend

|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)

||/ Name          Version      Architecture Description

+++-==============-============-============-=================================

ii  memtest86+    5.31b+dfsg-4 amd64        thorough real-mode memory tester

That looks ok but did you check /boot/grub/grub.cfg as I asked in my previous post?

Evo2.

Quote:

Originally Posted by evo2 (Post 6384998)

That looks ok but did you check /boot/grub/grub.cfg as I asked in my previous post?

Evo2.

Thanks.

Here you go:

Code:

$ cat /boot/grub/grub.cfg

Code:

#

# 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 [ "${initrdfail}" = 2 ]; then

  set initrdfail=

elif [ "${initrdfail}" = 1 ]; then

  set next_entry="${prev_entry}"

  set prev_entry=

  save_env prev_entry

  if [ "${next_entry}" ]; then

      set initrdfail=2

  fi

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 initrdfail {

    if [ -n "${have_grubenv}" ]; then if [ -n "${partuuid}" ]; then

      if [ -z "${initrdfail}" ]; then

        set initrdfail=1

        if [ -n "${boot_once}" ]; then

          set prev_entry="${default}"

          save_env prev_entry

        fi

      fi

      save_env initrdfail

    fi; 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,msdos5'

if [ x$feature_platform_search_hint = xy ]; then

  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  f0e43764-e41d-47f9-8fdb-d2448553941d

else

  search --no-floppy --fs-uuid --set=root f0e43764-e41d-47f9-8fdb-d2448553941d

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_IE

  insmod gettext

fi

terminal_output gfxterm

if [ "${recordfail}" = 1 ] ; then

  set timeout=30

else

  if [ x$feature_timeout_style = xy ] ; then

    set timeout_style=hidden

    set timeout=10

  # Fallback hidden-timeout code in case the timeout_style feature is

  # unavailable.

  elif sleep --interruptible 10 ; then

    set timeout=0

  fi

fi

play 480 440 1

### 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/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 [ ${grub_platform} != pc ]; then

      set linux_gfx_mode=keep

    elif 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

menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-f0e43764-e41d-47f9-8fdb-d2448553941d' {

        recordfail

        load_video

        gfxmode $linux_gfx_mode

        insmod gzio

        if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi

        insmod part_msdos

        insmod ext2

        set root='hd0,msdos5'

        if [ x$feature_platform_search_hint = xy ]; then

          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  f0e43764-e41d-47f9-8fdb-d2448553941d

        else

          search --no-floppy --fs-uuid --set=root f0e43764-e41d-47f9-8fdb-d2448553941d

        fi

        linux        /boot/vmlinuz-5.15.0-48-generic root=UUID=f0e43764-e41d-47f9-8fdb-d2448553941d ro  quiet splash $vt_handoff

        initrd        /boot/initrd.img-5.15.0-48-generic

}

submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-f0e43764-e41d-47f9-8fdb-d2448553941d' {

        menuentry 'Ubuntu, with Linux 5.15.0-48-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-48-generic-advanced-f0e43764-e41d-47f9-8fdb-d2448553941d' {

                recordfail

                load_video

                gfxmode $linux_gfx_mode

                insmod gzio

                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi

                insmod part_msdos

                insmod ext2

                set root='hd0,msdos5'

                if [ x$feature_platform_search_hint = xy ]; then

                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  f0e43764-e41d-47f9-8fdb-d2448553941d

                else

                  search --no-floppy --fs-uuid --set=root f0e43764-e41d-47f9-8fdb-d2448553941d

                fi

                echo        'Loading Linux 5.15.0-48-generic ...'

                linux        /boot/vmlinuz-5.15.0-48-generic root=UUID=f0e43764-e41d-47f9-8fdb-d2448553941d ro  quiet splash $vt_handoff

                echo        'Loading initial ramdisk ...'

                initrd        /boot/initrd.img-5.15.0-48-generic

        }

        menuentry 'Ubuntu, with Linux 5.15.0-48-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-48-generic-recovery-f0e43764-e41d-47f9-8fdb-d2448553941d' {

                recordfail

                load_video

                insmod gzio

                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi

                insmod part_msdos

                insmod ext2

                set root='hd0,msdos5'

                if [ x$feature_platform_search_hint = xy ]; then

                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  f0e43764-e41d-47f9-8fdb-d2448553941d

                else

                  search --no-floppy --fs-uuid --set=root f0e43764-e41d-47f9-8fdb-d2448553941d

                fi

                echo        'Loading Linux 5.15.0-48-generic ...'

                linux        /boot/vmlinuz-5.15.0-48-generic root=UUID=f0e43764-e41d-47f9-8fdb-d2448553941d ro recovery nomodeset dis_ucode_ldr 

                echo        'Loading initial ramdisk ...'

                initrd        /boot/initrd.img-5.15.0-48-generic

        }

        menuentry 'Ubuntu, with Linux 5.15.0-47-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-47-generic-advanced-f0e43764-e41d-47f9-8fdb-d2448553941d' {

                recordfail

                load_video

                gfxmode $linux_gfx_mode

                insmod gzio

                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi

                insmod part_msdos

                insmod ext2

                set root='hd0,msdos5'

                if [ x$feature_platform_search_hint = xy ]; then

                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  f0e43764-e41d-47f9-8fdb-d2448553941d

                else

                  search --no-floppy --fs-uuid --set=root f0e43764-e41d-47f9-8fdb-d2448553941d

                fi

                echo        'Loading Linux 5.15.0-47-generic ...'

                linux        /boot/vmlinuz-5.15.0-47-generic root=UUID=f0e43764-e41d-47f9-8fdb-d2448553941d ro  quiet splash $vt_handoff

                echo        'Loading initial ramdisk ...'

                initrd        /boot/initrd.img-5.15.0-47-generic

        }

        menuentry 'Ubuntu, with Linux 5.15.0-47-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-47-generic-recovery-f0e43764-e41d-47f9-8fdb-d2448553941d' {

                recordfail

                load_video

                insmod gzio

                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi

                insmod part_msdos

                insmod ext2

                set root='hd0,msdos5'

                if [ x$feature_platform_search_hint = xy ]; then

                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5  f0e43764-e41d-47f9-8fdb-d2448553941d

                else

                  search --no-floppy --fs-uuid --set=root f0e43764-e41d-47f9-8fdb-d2448553941d

                fi

                echo        'Loading Linux 5.15.0-47-generic ...'

                linux        /boot/vmlinuz-5.15.0-47-generic root=UUID=f0e43764-e41d-47f9-8fdb-d2448553941d ro recovery nomodeset dis_ucode_ldr 

                echo        'Loading initial ramdisk ...'

                initrd        /boot/initrd.img-5.15.0-47-generic

        }

}



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



### BEGIN /etc/grub.d/10_linux_zfs ###

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



### 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 ###

### 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 ###

Quote:

Originally Posted by jkcray (Post 6385084)

Thanks.

Here you go:

Code:

$ cat /boot/grub/grub.cfg

Weird, I can see the memtest section but it is empty.

What happens when you run update-grub?
Eg

Code:

sudo update-grub

Quote:

Originally Posted by evo2 (Post 6385087)

Weird, I can see the memtest section but it is empty.

What happens when you run update-grub?
Eg

Code:

sudo update-grub

Hi.
Ran update-grub just now:

Code:

$ sudo update-grub

Sourcing file `/etc/default/grub'

Sourcing file `/etc/default/grub.d/init-select.cfg'

Generating grub configuration file ...

Found linux image: /boot/vmlinuz-5.15.0-48-generic

Found initrd image: /boot/initrd.img-5.15.0-48-generic

Found linux image: /boot/vmlinuz-5.15.0-47-generic

Found initrd image: /boot/initrd.img-5.15.0-47-generic

Memtest86+ needs a 16-bit boot, that is not available on EFI, exiting

Warning: os-prober will not be executed to detect other bootable partitions.

Systems on them will not be added to the GRUB boot configuration.

Check GRUB_DISABLE_OS_PROBER documentation entry.

Adding boot menu entry for UEFI Firmware Settings ...

done

Perhaps the output " Memtest86+ needs a 16-bit boot, that is not available on EFI, exiting"
is informative?

Thanks.