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

edit /etc/default/grub
add or uncomment GRUB_DISABLE_OS_PROBER=false
save that file then run
sudo update-grub or sudo grub-mkconfig -o /boot/grub/grub.cfg

1 Like

edit /etc/default/grub
add or uncomment GRUB_DISABLE_OS_PROBER=false
save that file then run
sudo update-grub or
sudo grub-mkconfig -o /boot/grub/grub.cfg

8 Likes

I don’t really understand this post and solution. And I thought you were (publicly) uninstalling and leaving Endeavour?

3 Likes

arch and all derivatives now disable os-prober by default. if you want it to work you must enable it. it’s true for arch, endeavour, manjaro, and all the other arch derivatives.

Thanks for the heads up! :grinning_face_with_smiling_eyes:

Please do not post garbage commands.

1 Like

They are not garbage

Yes they are. Don’t output to /dev files.

2 Likes

Output to /dev files? What are you going on about?

Depends if the arch derivative inherits grub from upstream arch repos, or maintains grub themselves. They may have a different grub config setup.

1 Like

Smart

Right. /boot/grub/grub.cfg

My mind is warped tonight

This is why I don’t work it or bother trying to get certified

Ty for pointing that out

2 Likes

i do not get where this change is done from Arch-side and on my side i still can use os-prober without the need to add any change to my /etc/default/grub file, where comes this information from?

2 Likes

depending on where come from Grub2
since last boothole and the hundred commit series concerning Secureboot ( 2021 march )

https://git.savannah.gnu.org/cgit/grub.git
https://git.savannah.gnu.org/cgit/grub.git/log/

and this patch
https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00193.html
==> os-prober is not patched at the moment

1 Like

this is a real issue. just google the title of this thread.

Funny story: I’ve already bumped into this and I struggled with the solution because I had a typo in GRUB_DISABLE_OS_PROBER in my config and was nonplussed as to why it doesn’t work. took me an hour of trying various things to no avail, until I discovered my typo :slight_smile:

6 Likes

so looks like hardcoded default option is changed to not use os-prober per default, but i do not set my /etc/default/grub to use os-prober and grub-mkconfig still use it:

[13:11:47] joekamprad :: Ungeheuer64  ➜  ~ » pacman -Qs grub
local/grub 2:2.04-10
    GNU GRand Unified Bootloader (2)
local/grub-tools 1.6.5-1
    Fixes, additions and enhancements to grub and os-prober.
local/grub2-theme-endeavouros 20210131-1
    EndeavourOS grub2 theme
local/python-markdown 3.3.4-1
    Python implementation of John Gruber's Markdown.
[13:11:56] joekamprad :: Ungeheuer64  ➜  ~ » sudo grub-mkconfig -o /boot/grub/grub.cfg
[sudo] Passwort für joekamprad: 
Generating grub configuration file ...
Found theme: /boot/grub/themes/EndeavourOS/theme.txt
Found linux image: /boot/vmlinuz-linux-lts
Found initrd image: /boot/intel-ucode.img /boot/initramfs-linux-lts.img
Found fallback initrd image(s) in /boot: initramfs-linux-lts-fallback.img
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/intel-ucode.img /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot: initramfs-linux-fallback.img
Found EndeavourOS Linux (rolling) on /dev/sda2
Found Windows Boot Manager on /dev/sdd1@/efi/Microsoft/Boot/bootmgfw.efi
done
Apr 28 13:12:22 Ungeheuer64 os-prober[838472]: debug: running /usr/lib/os-probes/mounted/10qnx on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 10qnx[838474]: debug: /dev/sda1 is not a QNX4 partition: exiting
Apr 28 13:12:22 Ungeheuer64 os-prober[838475]: debug: running /usr/lib/os-probes/mounted/20macosx on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 macosx-prober[838477]: debug: /dev/sda1 is not an HFS+ partition: exiting
Apr 28 13:12:22 Ungeheuer64 os-prober[838478]: debug: running /usr/lib/os-probes/mounted/20microsoft on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 20microsoft[838480]: debug: Skipping legacy bootloaders on UEFI system
Apr 28 13:12:22 Ungeheuer64 os-prober[838481]: debug: running /usr/lib/os-probes/mounted/30utility on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 30utility[838483]: debug: /dev/sda1 is a FAT32 partition
Apr 28 13:12:22 Ungeheuer64 os-prober[838490]: debug: running /usr/lib/os-probes/mounted/40lsb on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 os-prober[838496]: debug: running /usr/lib/os-probes/mounted/70hurd on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 os-prober[838502]: debug: running /usr/lib/os-probes/mounted/80minix on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 os-prober[838504]: debug: running /usr/lib/os-probes/mounted/83haiku on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 83haiku[838507]: debug: /dev/sda1 is not a BeFS partition: exiting
Apr 28 13:12:22 Ungeheuer64 os-prober[838509]: debug: running /usr/lib/os-probes/mounted/90linux-distro on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 os-prober[838525]: debug: running /usr/lib/os-probes/mounted/90solaris on mounted /dev/sda1
Apr 28 13:12:22 Ungeheuer64 os-prober[838545]: debug: running /usr/lib/os-probes/mounted/05efi on mounted /dev/sda2
Apr 28 13:12:22 Ungeheuer64 05efi[838547]: debug: /dev/sda2 is ext4 partition: exiting
Apr 28 13:12:22 Ungeheuer64 os-prober[838548]: debug: running /usr/lib/os-probes/mounted/10freedos on mounted /dev/sda2
Apr 28 13:12:22 Ungeheuer64 10freedos[838550]: debug: /dev/sda2 is not a FAT partition: exiting
Apr 28 13:12:22 Ungeheuer64 os-prober[838551]: debug: running /usr/lib/os-probes/mounted/10qnx on mounted /dev/sda2

I had it happen on mine on an Arch install that i got these messages when grub updated.

2 Likes

so the problem with grub is a security issue with os-prober?

in 2020 there was first boothole
https://www.phoronix.com/scan.php?page=news_item&px=BootHole-GRUB2-Secure-Boot

then in grub2 in 2021 ( more than 117 patches )
https://www.phoronix.com/scan.php?page=news_item&px=GRUB-2021-Secure-Boot-Issues

see these link
https://git.savannah.gnu.org/cgit/grub.git
https://git.savannah.gnu.org/cgit/grub.git/log/

os-prober is still under work , not patched , by default is now false
https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00193.html

and this post
https://lists.gnu.org/archive/html/grub-devel/2021-04/msg00086.html

( last version 2.04 tagged is more than 3 or 4 years )
git grub savannah is patched by “common” distributions linux for all architecture cpu boot , inside any distribution they have also 200 patches that cant be updated on main git ( too specific )

and that give very difficult work to validate theses different patches after

right. so bad idea using os-prober