/usr/include/libreoffice/uno/ is in libreoffice-dev-common 1:6.0.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libreoffice/uno/Enterable.h
/usr/include/libreoffice/uno/EnvDcp.h
/usr/include/libreoffice/uno/any2.h
/usr/include/libreoffice/uno/current_context.h
/usr/include/libreoffice/uno/current_context.hxx
/usr/include/libreoffice/uno/data.h
/usr/include/libreoffice/uno/dispatcher.h
/usr/include/libreoffice/uno/dispatcher.hxx
/usr/include/libreoffice/uno/environment.h
/usr/include/libreoffice/uno/environment.hxx
/usr/include/libreoffice/uno/lbnames.h
/usr/include/libreoffice/uno/mapping.h
/usr/include/libreoffice/uno/mapping.hxx
/usr/include/libreoffice/uno/sequence2.h
/usr/include/libreoffice/uno/threadpool.h