/usr/ is in libubuntu-app-launch3-dev 0.12+17.04.20170404.2-0ubuntu6.
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..
/usr/include/
/usr/include/libubuntu-app-launch-3/
/usr/include/libubuntu-app-launch-3/ubuntu-app-launch/
/usr/include/libubuntu-app-launch-3/ubuntu-app-launch/appid.h
/usr/include/libubuntu-app-launch-3/ubuntu-app-launch/application.h
/usr/include/libubuntu-app-launch-3/ubuntu-app-launch/helper.h
/usr/include/libubuntu-app-launch-3/ubuntu-app-launch/oom.h
/usr/include/libubuntu-app-launch-3/ubuntu-app-launch/registry.h
/usr/include/libubuntu-app-launch-3/ubuntu-app-launch/type-tagger.h
/usr/include/libubuntu-app-launch-3/ubuntu-app-launch.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/ubuntu-app-launch-3.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libubuntu-app-launch3-dev/
/usr/share/doc/libubuntu-app-launch3-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/UbuntuAppLaunch-3.gir
/usr/lib/x86_64-linux-gnu/libubuntu-app-launch.so
/usr/share/doc/libubuntu-app-launch3-dev/changelog.Debian.gz