grub2 custom_40 not read at bootup

[francois.e]

It seems that grub2 custom_40 not read at bootup.
Here are my essential files:
/etc/default/grub

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GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true
GRUB_TIMEOUT=3
GRUB_DISTRIBUTOR=`Debian`
GRUB_DEFAULT=2  #2 pour 40_custom première entrée.

#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

GRUB_CMDLINE_LINUX=""

# If you want to enable the save default function, uncomment the following
# line, and set GRUB_DEFAULT to saved.
GRUB_SAVEDEFAULT=true

# Preload both GPT and MBR modules so that they are not missed
GRUB_PRELOAD_MODULES="part_gpt part_msdos"

# Uncomment to enable Hidden Menu, and optionally hide the timeout count
#GRUB_HIDDEN_TIMEOUT=5
#GRUB_HIDDEN_TIMEOUT_QUIET=true

# Uncomment to use basic console
GRUB_TERMINAL_INPUT=console

# Uncomment to disable graphical terminal
#GRUB_TERMINAL_OUTPUT=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=auto

# Uncomment to allow the kernel use the same resolution used by grub
GRUB_GFXPAYLOAD_LINUX=keep

# Uncomment if you want GRUB to pass to the Linux kernel the old parameter
# format "root=/dev/xxx" instead of "root=/dev/disk/by-uuid/xxx"
#GRUB_DISABLE_LINUX_UUID=true

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

# Uncomment and set to the desired menu colors.  Used by normal and wallpaper
# modes only.  Entries specified as foreground/background.
GRUB_COLOR_NORMAL="light-gray/black"
GRUB_COLOR_HIGHLIGHT="green/black"

# Uncomment one of them for the gfx desired, a image background or a gfxtheme
GRUB_BACKGROUND="/usr/share/grub/background.png"
GRUB_THEME="/boot/grub/themes/Manjaro-Default/theme.txt"


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


and
/etc/grub.d/custom_40

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#!/bin/sh
exec tail -n +3 $0
# 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.

# ajout fl en dessous

# path to the partition holding ISO images (using UUID)
probe -u $root --set=rootuuid
set imgdevpath="/dev/disk/by-uuid/$rootuuid"

menuentry "debian-live-10.6.0-amd64-xfce.iso" {
    set isofile="/isos/debian-live-10.6.0-amd64-xfce.iso"
    loopback aloop (hd1,3)$isofile
    linux  (aloop)/live/vmlinuz-4.19.0-11-amd64 boot=live findiso=$isofile live-media-path=/live components
    initrd (aloop)/live/initrd.img-4.19.0-11-amd64
}
menuentry "Porteus41 XFCE x86-64 iso" {
insmod part_msdos
insmod ext2
set root=(hd1,3)
set isofile="/isos/Porteus-XFCE-v4.0-x86_64.iso"
search --no-floppy --file --set=root $isofile
loopback loop $isofile
linux (loop)/boot/syslinux/vmlinuz from=$isofile changes=/41_porteus login=root extramod=UUID:5ef211e4-004a-4a22-9cc2-f39edcd73f7b/41_porteus/xfce extramod=UUID:5ef211e4-004a-4a22-9cc2-f39edcd73f7b/64_V40/porteus
initrd (loop)/boot/syslinux/initrd.xz
}

[Head_on_a_Stick]

You need to use the 'update-grub' command to add /etc/grub.d/40_custom (not "custom_40") to the boot menu. Anything in /boot/grub/custom.cfg will be added to the menu even if the 'update-grub' command isn't used.

[francois.e]

I changed

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GRUB_DISTRIBUTOR=`Debian`

for

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

Then I could:

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update-grub

And the the custom_40 menu appearead at bootup.

However, trying now to update-grub I get:

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fl@francois-asus:~$ sudo grub-update
[sudo] password for fl:
sudo: grub-update: command not found
fl@francois-asus:~$

Any comments or suggestions appreciated.
Thanks.

[Head_on_a_Stick]

Yes, I also have trouble remembering the order of the words in the 'update-grub' command so I just run the command inside the wrapper script directly:

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# grub-mkconfig -o /boot/grub/grub.cfg

^ I find that *much* easier to remember.

[francois.e]

You will be surprised, I was about to try it.
Very nice to you to answer this one. It could be too much boose, but it isn't.
Best thing for me is to go to bed right now.

You have been giving your time for years on this forum.
I am grateful.
Happy holiday!

[p.H]

Anything in /boot/grub/custom.cfg will be added to the menu

WARNING : /etc/grub.d/41_custom adds the following instructions to include the contents of custom.cfg at boot time :

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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

So if $config_directory is defined at boot time, GRUB will load custom.cfg from this location instead of $prefix (/boot/grub).
It is unclear which circumstances define $config_directory, but it appears that when GRUB signed for EFI secure boot is used, $config_directory points to EFI/debian in the EFI partition, so this is where GRUB will look for custom.cfg.