/usr/ is in liblightdm-gobject-1-dev 1.26.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/liblightdm-gobject-1.so
/usr/include/
/usr/include/lightdm-gobject-1/
/usr/include/lightdm-gobject-1/lightdm/
/usr/include/lightdm-gobject-1/lightdm/greeter.h
/usr/include/lightdm-gobject-1/lightdm/language.h
/usr/include/lightdm-gobject-1/lightdm/layout.h
/usr/include/lightdm-gobject-1/lightdm/power.h
/usr/include/lightdm-gobject-1/lightdm/session.h
/usr/include/lightdm-gobject-1/lightdm/system.h
/usr/include/lightdm-gobject-1/lightdm/user.h
/usr/include/lightdm-gobject-1/lightdm.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/liblightdm-gobject-1.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/liblightdm-gobject-1-dev/
/usr/share/doc/liblightdm-gobject-1-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/LightDM-1.gir
/usr/share/vala/
/usr/share/vala/vapi/
/usr/share/vala/vapi/liblightdm-gobject-1.deps
/usr/share/vala/vapi/liblightdm-gobject-1.vapi
/usr/share/doc/liblightdm-gobject-1-dev/changelog.Debian.gz