digitalmailing wrote: > Is there a reason why GRUB_DISABLE_OS_PROBER=false > in /etc/default/grub is commented by default after > installation of bookworm or grub? Yes. It's a new change, mentioned in the upgrade notes. https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#grub-os-prober -dsr-