Package: grub-pc Version: 2.06-2 We see two warnings:
Setting up linux-image-5.15.0-2-amd64 (5.15.5-1) ... ... 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. Setting up grub-pc (2.06-2) ... ... 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. We look at (info "(grub) Simple configuration") and read about GRUB_DISABLE_OS_PROBER. But nowhere is it mentioned how to turn off those two warnings. No, we don't want to turn on the prober. We just want to turn off the warnings.

