If you’re in an experimental state of mind - rEFInd might be worth a try. As you’re planning to use the grub entries anyway, just an install (with no configuring at all) should get you going with an alternative… and it has the advantage that changes and updates in the systems should not affect the boot setup.
Fairly easy to remove too 
At this stage I am open to all alternatives. Just a bit overwhelmed right now with the abundance of possibilities and wealth of info. But sure, I’ll be looking att rEFInd as well. It sounds like a viable option. Thanks for pointing it out!
Here is how the disk looks like so far:
Model: SKHynix_HFS001TD9TNG-L3A0B (nvme)
Disk /dev/nvme0n1: 1024GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 106MB 105MB fat32 boot, esp
2 106MB 53.8GB 53.7GB btrfs
3 53.8GB 53.9GB 105MB fat32 boot, esp
4 53.9GB 108GB 53.7GB btrfs
sudo blkid
/dev/nvme0n1p1: LABEL_FATBOOT="ESP" LABEL="ESP" UUID="D79B-9C85" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="689038fd-31b5-454c-a4e2-0e2481a22c15"
/dev/nvme0n1p2: UUID="90793bd8-8680-45f2-88d6-05b1b9968539" UUID_SUB="aa3348e0-34b2-4fdb-b228-ec367f72eecf" BLOCK_SIZE="4096" TYPE="btrfs" PARTUUID="96d845dc-0970-4cc1-a199-081ac4e4bcb1"
/dev/nvme0n1p3: UUID="7259-3050" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="44bb85af-b67c-4681-ac41-3e9b64c44a16"
/dev/nvme0n1p4: UUID="1a1b20eb-6fb5-46fc-9666-3b0e6f4c4300" UUID_SUB="15e84ebd-2381-4a19-9064-eac3fe7e282b" BLOCK_SIZE="4096" TYPE="btrfs" PARTUUID="35690940-29f4-43ba-ab65-dff50f389e97"
And here is
efibootmgr -v
BootCurrent: 0005
Timeout: 0 seconds
BootOrder: 0005,0000,0002,0003,2001,2002,2003
Boot0000* EndeavourOS HD(3,GPT,44bb85af-b67c-4681-ac41-3e9b64c44a16,0x6432800,0x32000)/File(\EFI\EndeavourOS\grubx64.efi)
Boot0001* EFI USB Device (Sony Storage Media) UsbWwid(54c,5ba,0,CB07105833BB15C22)/HD(2,MBR,0xa4e000b7,0x73b5c00,0x10000)RC
Boot0002* EFI Hard Drive (SKHynix_HFS001TD9TNG-L3A0B) PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0)/NVMe(0x1,00-00-00-00-00-00-00-00)/HD(1,GPT,689038fd-31b5-454c-a4e2-0e2481a22c15,0x800,0x32000)RC
Boot0003* EFI Hard Drive 1 (SKHynix_HFS001TD9TNG-L3A0B) PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0)/NVMe(0x1,00-00-00-00-00-00-00-00)/HD(3,GPT,44bb85af-b67c-4681-ac41-3e9b64c44a16,0x6432800,0x32000)RC
Boot0005* EnOS-Plasma HD(1,GPT,689038fd-31b5-454c-a4e2-0e2481a22c15,0x800,0x32000)/File(\EFI\endeavouros\grubx64.efi)
Boot2001* EFI USB Device RC
Boot2002* EFI DVD/CDROM RC
I can now choose between the two OS from the bios boot menu (EndeavourOS and EnOS-Plasma).
So if the Manjaro’s fix for os-probr with btrfs will work out the I guess I can stick with Grub. Otherwise I should be looking at rEFInd I guess.
@Manuel,
Thank you for this! It works perfectly!
Here it is, running from the first os on /dev/nvme0n1p2:
sudo os-prober
/dev/nvme0n1p4:EndeavourOS:EndeavourOS:linux:btrfs:UUID=1a1b20eb-6fb5-46fc-9666-3b0e6f4c4300:subvol=@
sudo grub-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
Found theme: /boot/grub/themes/EndeavourOS/theme.txt
Found linux image: /boot/vmlinuz-linux-zen
Found initrd image: /boot/amd-ucode.img /boot/initramfs-linux-zen.img
Found fallback initrd image(s) in /boot: initramfs-linux-zen-fallback.img
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/amd-ucode.img /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot: initramfs-linux-fallback.img
Found EndeavourOS on /dev/nvme0n1p4
done
After reboot, all the entries on Grub menu. Boots fine to both systems.
Thank you @Manuel and the Manjaro devs!
Now I am off to get some sleep.
All btrfs (and grub) users here, please test the following (same commands as above) and report the results here!
Maybe we can make this a package later, if this works for all. 
cd /tmp
git clone https://gitlab.manjaro.org/packages/community/os-prober.git
cd os-prober
makepkg -cf
sudo pacman -U os-prober-1.*.pkg.tar.* # this line installs it
You need to add cd os-prober after git clone …
Thanks! Just added it.
I’ve installed Endeavour on 2 drives (GPT) both with btrfs (and both with their own /boot/efi fat32) and they see each other (only after the manjaro os-prober) so it’s a success.
But they can’t see my KDE Neon (Ubuntu 20.04) partition on a 3rd drive which is also btrfs with a fat32 boot, I know this isn’t the same thing, just saying !
OK, it is not a general solution yet. But sounds quite strange.
Do you have any idea why they can’t see KDE Neon?
I’ve got a pending update now for os-prober 1-77-1 >> 1-77-2. Will this overwrite Manjaro’s os-prober that I installed?
Yes, it should do that as far as I know.
Should check what they have changed.
However, it is also easy to test both and use the one that works for you.
EDIT: os-prober from Arch is already 1.77-2. Manjaro has 1.77-1, and that makes it always get the Arch version.
You may consider adding IgnorePkg = os-prober into /etc/pacman.conf.
Alternatively, you could create a small script that:
You just need to run that script if os-prober is updated by Arch. To optimize a bit, the script could be executed always when grub-mkconfig is run…
So either way, a bit more work than usual.
@manuel I’m not sure (I’ve checked it does have lsb-release) but after reading online it seems to have to do with having multiple kernels with different names which ubuntu’s grub takes care of so it may be using a different schema.
However, due to the multiple kernels, I think it would be far less problematic to use Ubuntu’s grub to find the Arch installs whose kernel names don’t change (which it won’t do coz it obviously doesn’t have the Manjaro patch). So that won’t work until Ubuntu patch their grub, groan!
Anyway, if you want I’ll try and test things but it’s really not a bother to me.
I’m not “pushing” you to test this, but of course if you have the willingness and time to do that, I’d appreciate!
But it is totally up to you.
Ok sure, what do you want me to check?
This is Neon’s /boot:
config-5.4.0-45-generic memtest86+.elf
config-5.4.0-47-generic memtest86+_multiboot.bin
efi System.map-5.4.0-45-generic
grub System.map-5.4.0-47-generic
initrd.img vmlinuz
initrd.img-5.4.0-45-generic vmlinuz-5.4.0-45-generic
initrd.img-5.4.0-47-generic vmlinuz-5.4.0-47-generic
initrd.img.old vmlinuz.old
memtest86+.bin
This is /boot/grub:
fonts gfxblacklist.txt grub.cfg grubenv themes unicode.pf2 x86_64-efi
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 $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
if [ "${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="${default}"
save_env prev_entry
fi
fi
save_env initrdfail
fi; fi
}
function recordfail {
set recordfail=1
# GRUB lacks write support for btrfs, so recordfail support is disabled.
}
function load_video {
if [ x$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$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_gpt
insmod btrfs
set root='hd3,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd3,gpt2 --hint-efi=hd3,gpt2 --hint-baremetal=ahci3,gpt2 f8ba0579-95d1-4242-abe1-31b8436b0006
else
search --no-floppy --fs-uuid --set=root f8ba0579-95d1-4242-abe1-31b8436b0006
fi
font="/@/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
fi
terminal_output gfxterm
insmod part_gpt
insmod btrfs
set root='hd3,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd3,gpt2 --hint-efi=hd3,gpt2 --hint-baremetal=ahci3,gpt2 f8ba0579-95d1-4242-abe1-31b8436b0006
else
search --no-floppy --fs-uuid --set=root f8ba0579-95d1-4242-abe1-31b8436b0006
fi
insmod gfxmenu
loadfont ($root)/@/boot/grub/themes/breeze/unifont-bold-16.pf2
loadfont ($root)/@/boot/grub/themes/breeze/unifont-regular-14.pf2
loadfont ($root)/@/boot/grub/themes/breeze/unifont-regular-16.pf2
loadfont ($root)/@/boot/grub/themes/breeze/unifont-regular-32.pf2
insmod png
set theme=($root)/@/boot/grub/themes/breeze/theme.txt
export theme
if [ "${recordfail}" = 1 ] ; then
set timeout=5
else
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
fi
fi
if [ $grub_platform = efi ]; then
set timeout=5
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
fi
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
### 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 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 'Neon GNU/Linux' --class neon --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-f8ba0579-95d1-4242-abe1-31b8436b0006' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod btrfs
set root='hd3,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd3,gpt2 --hint-efi=hd3,gpt2 --hint-baremetal=ahci3,gpt2 f8ba0579-95d1-4242-abe1-31b8436b0006
else
search --no-floppy --fs-uuid --set=root f8ba0579-95d1-4242-abe1-31b8436b0006
fi
linux /@/boot/vmlinuz-5.4.0-47-generic root=UUID=f8ba0579-95d1-4242-abe1-31b8436b0006 ro rootflags=subvol=@ resume=UUID=80b9f07f-0593-48ae-8621-959d21dbfe3f quiet splash $vt_handoff
initrd /@/boot/initrd.img-5.4.0-47-generic
}
submenu 'Advanced options for Neon GNU/Linux' $menuentry_id_option 'gnulinux-advanced-f8ba0579-95d1-4242-abe1-31b8436b0006' {
menuentry 'Neon GNU/Linux, with Linux 5.4.0-47-generic' --class neon --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.4.0-47-generic-advanced-f8ba0579-95d1-4242-abe1-31b8436b0006' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod btrfs
set root='hd3,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd3,gpt2 --hint-efi=hd3,gpt2 --hint-baremetal=ahci3,gpt2 f8ba0579-95d1-4242-abe1-31b8436b0006
else
search --no-floppy --fs-uuid --set=root f8ba0579-95d1-4242-abe1-31b8436b0006
fi
echo 'Loading Linux 5.4.0-47-generic ...'
linux /@/boot/vmlinuz-5.4.0-47-generic root=UUID=f8ba0579-95d1-4242-abe1-31b8436b0006 ro rootflags=subvol=@ resume=UUID=80b9f07f-0593-48ae-8621-959d21dbfe3f quiet splash $vt_handoff
echo 'Loading initial ramdisk ...'
initrd /@/boot/initrd.img-5.4.0-47-generic
}
menuentry 'Neon GNU/Linux, with Linux 5.4.0-45-generic' --class neon --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.4.0-45-generic-advanced-f8ba0579-95d1-4242-abe1-31b8436b0006' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod btrfs
set root='hd3,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd3,gpt2 --hint-efi=hd3,gpt2 --hint-baremetal=ahci3,gpt2 f8ba0579-95d1-4242-abe1-31b8436b0006
else
search --no-floppy --fs-uuid --set=root f8ba0579-95d1-4242-abe1-31b8436b0006
fi
echo 'Loading Linux 5.4.0-45-generic ...'
linux /@/boot/vmlinuz-5.4.0-45-generic root=UUID=f8ba0579-95d1-4242-abe1-31b8436b0006 ro rootflags=subvol=@ resume=UUID=80b9f07f-0593-48ae-8621-959d21dbfe3f quiet splash $vt_handoff
echo 'Loading initial ramdisk ...'
initrd /@/boot/initrd.img-5.4.0-45-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/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 ###
I think this should do it for the moment. But then should i keep track of Manjaro’s os-probers’s updates on the GitLab page?
@pebcak Did you check the difference? I am sure I remember that the version numbers of Arch and Manjaro were the same when an author online tested this and Manjaro’s patch wasn’t in Arch’s files even though they were the same version.
No, I haven’t yet but I’ll do that.
Thanks! I have already put Arch’s on the ignore list.
And if I’m right then yes you should block Arch’s os-prober and manually update Manjaro’s as you deem necessary.
Yes.
That is quite easy to do if you clone the gitlab repository:
mkdir -p ~/where/you/want/to/keep/this cd ~/where/you/want/to/keep/this # Assuming you have already done this: git clone ... git pull
If git pull says something has changed, then Manjaro has a new version. The same procedure can be applied again, starting with command cd os-prober.