Bug with os-prober

[4n0nym0u53]

### BUG REPORT ###

BUG DESCRIPTION

grub was recently upgraded to 2.04-19. Before the upgrade, os-prober would be enabled by default, without `GRUB_DISABLE_OS_PROBER` in `/etc/default/grub` file. Now it's disabled by default and I have to enable it manually, which in itself is no problem at all.

The problem is, that when disabled, the following is added to `/boot/grub/grub.cfg`:

```

### BEGIN /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_os-prober ###### BEGIN /etc/grub.d/30_os-prober ###

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.

### END /etc/grub.d/30_os-prober ###

```

The three lines in the middle are not commented out, which results in the following error screen at boot, instead of grub:

```

error: can't find command 'os-prober'.

error: can't find command 'Systems'.

error: can't find command 'Check'.

```

After which it counts down from 10 and proceeds to the default first boot entry.

STEPS TO REPRODUCE

- Upgrade grub

- Disable os-prober

EXPECTED BEHAVIOUR

- System booting into grub

ACTUAL BEHAVIOUR

- The error screen described above

SYSTEM INFORMATION

PC: Lenovo Legion Y530

OS: Manjaro Linux

Kernel: 5.11.2-1-MANJARO

grub version: 2.04-19

Disk setup: LUKS encrypted Manjaro installation on one partition, Windows 10 installation on another (NVME). Linux home partition on seperate disk. `/boot/` not encrypted.

`/etc/default/grub` attached.

Output of `inxi -Fxxxzad --no-host` attached.

Public PGP key attached, in case you need additional (possibly sensitive) information.

grub
Description: Binary data

inxi
Description: Binary data

pub.key
Description: application/vnd.apple.keynote