/usr/share/live/build/templates/ is in live-build 3.0~a57-1ubuntu25.
This file is owned by root:root, with mode 0o755.
..
/usr/share/live/build/templates/cgi/
/usr/share/live/build/templates/cgi/debian/
/usr/share/live/build/templates/cgi/debian/build.html
/usr/share/live/build/templates/cgi/debian/footer.html
/usr/share/live/build/templates/cgi/debian/form.html
/usr/share/live/build/templates/cgi/debian/header.html
/usr/share/live/build/templates/cgi/debian/mail.txt
/usr/share/live/build/templates/grub/
/usr/share/live/build/templates/grub/menu.lst
/usr/share/live/build/templates/grub/splash.xpm.gz
/usr/share/live/build/templates/grub2/
/usr/share/live/build/templates/grub2/grub.cfg
/usr/share/live/build/templates/grub2/splash.tga
/usr/share/live/build/templates/silo/
/usr/share/live/build/templates/silo/debian.txt
/usr/share/live/build/templates/silo/debian.txt.install
/usr/share/live/build/templates/silo/silo.conf
/usr/share/live/build/templates/yaboot/
/usr/share/live/build/templates/yaboot/boot.msg
/usr/share/live/build/templates/yaboot/hfs.map
/usr/share/live/build/templates/yaboot/ofboot.b
/usr/share/live/build/templates/yaboot/pegasos
/usr/share/live/build/templates/yaboot/yaboot.conf