/usr/share/trajectory_msgs/ is in libtrajectory-msgs-dev 1.12.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/trajectory_msgs/cmake/
/usr/share/trajectory_msgs/cmake/trajectory_msgs-msg-extras.cmake
/usr/share/trajectory_msgs/cmake/trajectory_msgs-msg-paths.cmake
/usr/share/trajectory_msgs/cmake/trajectory_msgsConfig-version.cmake
/usr/share/trajectory_msgs/cmake/trajectory_msgsConfig.cmake
/usr/share/trajectory_msgs/msg/
/usr/share/trajectory_msgs/msg/JointTrajectory.msg
/usr/share/trajectory_msgs/msg/JointTrajectoryPoint.msg
/usr/share/trajectory_msgs/msg/MultiDOFJointTrajectory.msg
/usr/share/trajectory_msgs/msg/MultiDOFJointTrajectoryPoint.msg
/usr/share/trajectory_msgs/package.xml
/usr/share/trajectory_msgs/rules/
/usr/share/trajectory_msgs/rules/JointTrajectoryPoint_Groovy2Hydro_08.10.2013.bmr