/usr/share/geometry_msgs/msg/Pose2D.msg is in ros-geometry-msgs 1.12.5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # This expresses a position and orientation on a 2D manifold.
float64 x
float64 y
float64 theta
|