/usr/share/initramfs-tools/ is in cryptsetup 2:1.4.1-2ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/initramfs-tools/conf-hooks.d/
/usr/share/initramfs-tools/conf-hooks.d/cryptsetup
/usr/share/initramfs-tools/hooks/
/usr/share/initramfs-tools/hooks/cryptgnupg
/usr/share/initramfs-tools/hooks/cryptkeyctl
/usr/share/initramfs-tools/hooks/cryptopenct
/usr/share/initramfs-tools/hooks/cryptopensc
/usr/share/initramfs-tools/hooks/cryptpassdev
/usr/share/initramfs-tools/hooks/cryptroot
/usr/share/initramfs-tools/scripts/
/usr/share/initramfs-tools/scripts/local-bottom/
/usr/share/initramfs-tools/scripts/local-bottom/cryptopensc
/usr/share/initramfs-tools/scripts/local-top/
/usr/share/initramfs-tools/scripts/local-top/cryptopensc
/usr/share/initramfs-tools/scripts/local-top/cryptroot