/usr/share/initramfs-tools/ is in initramfs-tools-ubuntu-touch 0.72.
This file is owned by root:root, with mode 0o755.
..
/usr/share/initramfs-tools-ubuntu-touch/bootimg.cfg-grouper
/usr/share/initramfs-tools-ubuntu-touch/bootimg.cfg-maguro
/usr/share/initramfs-tools-ubuntu-touch/bootimg.cfg-mako
/usr/share/initramfs-tools-ubuntu-touch/bootimg.cfg-manta
/usr/share/initramfs-tools-ubuntu-touch/fstab
/usr/share/initramfs-tools/conf.d/
/usr/share/initramfs-tools/conf.d/touch
/usr/share/initramfs-tools/hooks/
/usr/share/initramfs-tools/hooks/touch
/usr/share/initramfs-tools/scripts/
/usr/share/initramfs-tools/scripts/panic/
/usr/share/initramfs-tools/scripts/panic/adbd
/usr/share/initramfs-tools/scripts/touch