/usr/share/libtool/libltdl/ is in libltdl-dev 2.4.2-1.7ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/libtool/libltdl/COPYING.LIB
/usr/share/libtool/libltdl/Makefile.am
/usr/share/libtool/libltdl/Makefile.in
/usr/share/libtool/libltdl/Makefile.inc
/usr/share/libtool/libltdl/README
/usr/share/libtool/libltdl/aclocal.m4
/usr/share/libtool/libltdl/argz.c
/usr/share/libtool/libltdl/argz_.h
/usr/share/libtool/libltdl/config-h.in
/usr/share/libtool/libltdl/configure
/usr/share/libtool/libltdl/configure.ac
/usr/share/libtool/libltdl/libltdl/
/usr/share/libtool/libltdl/libltdl/lt__alloc.h
/usr/share/libtool/libltdl/libltdl/lt__dirent.h
/usr/share/libtool/libltdl/libltdl/lt__glibc.h
/usr/share/libtool/libltdl/libltdl/lt__private.h
/usr/share/libtool/libltdl/libltdl/lt__strl.h
/usr/share/libtool/libltdl/libltdl/lt_dlloader.h
/usr/share/libtool/libltdl/libltdl/lt_error.h
/usr/share/libtool/libltdl/libltdl/lt_system.h
/usr/share/libtool/libltdl/libltdl/slist.h
/usr/share/libtool/libltdl/loaders/
/usr/share/libtool/libltdl/loaders/dld_link.c
/usr/share/libtool/libltdl/loaders/dlopen.c
/usr/share/libtool/libltdl/loaders/dyld.c
/usr/share/libtool/libltdl/loaders/load_add_on.c
/usr/share/libtool/libltdl/loaders/loadlibrary.c
/usr/share/libtool/libltdl/loaders/preopen.c
/usr/share/libtool/libltdl/loaders/shl_load.c
/usr/share/libtool/libltdl/lt__alloc.c
/usr/share/libtool/libltdl/lt__dirent.c
/usr/share/libtool/libltdl/lt__strl.c
/usr/share/libtool/libltdl/lt_dlloader.c
/usr/share/libtool/libltdl/lt_error.c
/usr/share/libtool/libltdl/ltdl.c
/usr/share/libtool/libltdl/ltdl.h
/usr/share/libtool/libltdl/slist.c