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