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

From	Peter Ehlert <pb21a@sdi-baja.com>
Newsgroups	linux.debian.user
Subject	SID: update-grub ---Warning: os-prober will not be executed to detect other bootable partitions.
Date	2021-12-09 17:30 +0100
Message-ID	<DsusV-39s-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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the full error message at the end of update-grub:

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.

Question: why would this desirable?
it's totally new to me.

Back story:
I just upgraded a Bullseye install to Sid.
this is a multi-boot machine, my daily driver is Bullseye.
after reboot my GRUB had only one entry

I was able to get it back (thanks to Google)
edit /etc/default/grub
add GRUB_DISABLE_OS_PROBER=false

saved then ran grub-install /dev/sd(foo) && update-grub

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SID: update-grub ---Warning: os-prober will not be executed to detect  other bootable partitions. Peter Ehlert <pb21a@sdi-baja.com> - 2021-12-09 17:30 +0100
  Re: SID: update-grub ---Warning: os-prober will not be executed to  detect other bootable partitions. David Wright <deblis@lionunicorn.co.uk> - 2021-12-09 20:20 +0100

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