/usr/share/mercurial/templates/raw/ is in mercurial-common 4.5.3-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/mercurial/templates/raw/changelog.tmpl
/usr/share/mercurial/templates/raw/changeset.tmpl
/usr/share/mercurial/templates/raw/error.tmpl
/usr/share/mercurial/templates/raw/fileannotate.tmpl
/usr/share/mercurial/templates/raw/filediff.tmpl
/usr/share/mercurial/templates/raw/graph.tmpl
/usr/share/mercurial/templates/raw/graphedge.tmpl
/usr/share/mercurial/templates/raw/graphnode.tmpl
/usr/share/mercurial/templates/raw/index.tmpl
/usr/share/mercurial/templates/raw/logentry.tmpl
/usr/share/mercurial/templates/raw/manifest.tmpl
/usr/share/mercurial/templates/raw/map
/usr/share/mercurial/templates/raw/notfound.tmpl
/usr/share/mercurial/templates/raw/search.tmpl