/usr/ is in live-boot-initramfs-tools 3.0~a24-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/initramfs-tools/
/usr/share/initramfs-tools/hooks/
/usr/share/initramfs-tools/hooks/live
/usr/share/initramfs-tools/scripts/
/usr/share/initramfs-tools/scripts/live-helpers
/usr/share/initramfs-tools/scripts/live-bottom/
/usr/share/initramfs-tools/scripts/live-bottom/23networking
/usr/share/initramfs-tools/scripts/live-bottom/30accessibility
/usr/share/initramfs-tools/scripts/live-bottom/08persistence_excludes
/usr/share/initramfs-tools/scripts/live-bottom/12fstab
/usr/share/initramfs-tools/scripts/live-bottom/10validateroot
/usr/share/initramfs-tools/scripts/live-bottom/24preseed
/usr/share/initramfs-tools/scripts/live-premount/
/usr/share/initramfs-tools/scripts/live-premount/readonly
/usr/share/initramfs-tools/scripts/live-premount/modules
/usr/share/initramfs-tools/scripts/live-premount/select_eth_device
/usr/share/initramfs-tools/scripts/live
/usr/share/initramfs-tools/scripts/live-functions
/usr/share/doc/
/usr/share/doc/live-boot-initramfs-tools/
/usr/share/doc/live-boot-initramfs-tools/copyright
/usr/share/doc/live-boot-initramfs-tools/changelog.Debian.gz