/usr/src/linux-source-4.4.0/debian/scripts/misc/ is in linux-source-4.4.0 4.4.0-31.50.
This file is owned by root:root, with mode 0o755.
..
/usr/src/linux-source-4.4.0/debian/scripts/misc/find-obsolete-firmware
/usr/src/linux-source-4.4.0/debian/scripts/misc/fw-to-ihex.sh
/usr/src/linux-source-4.4.0/debian/scripts/misc/gen-auto-reconstruct
/usr/src/linux-source-4.4.0/debian/scripts/misc/get-firmware
/usr/src/linux-source-4.4.0/debian/scripts/misc/getabis
/usr/src/linux-source-4.4.0/debian/scripts/misc/git-ubuntu-log
/usr/src/linux-source-4.4.0/debian/scripts/misc/insert-changes.pl
/usr/src/linux-source-4.4.0/debian/scripts/misc/insert-mainline-changes
/usr/src/linux-source-4.4.0/debian/scripts/misc/insert-ubuntu-changes
/usr/src/linux-source-4.4.0/debian/scripts/misc/kernelconfig
/usr/src/linux-source-4.4.0/debian/scripts/misc/retag
/usr/src/linux-source-4.4.0/debian/scripts/misc/splitconfig.pl
/usr/src/linux-source-4.4.0/debian/scripts/misc/update-aufs.sh
/usr/src/linux-source-4.4.0/debian/scripts/misc/update-zfs.sh