goldfish@goldfish-VirtualBox:~$ gazebo --verbose ~/ros2_ws/src/my_underwater_sim/worlds/ocean.world 
Gazebo multi-robot simulator, version 11.10.2
Copyright (C) 2012 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

[Msg] Waiting for master.
Gazebo multi-robot simulator, version 11.10.2
Copyright (C) 2012 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

[Msg] Waiting for master.
[Msg] Connected to gazebo master @ http://127.0.0.1:11345
[Msg] Publicized address: 10.0.2.15
[Wrn] [ModelDatabase.cc:340] Getting models from[http://models.gazebosim.org/]. This may take a few seconds.
[Msg] Connected to gazebo master @ http://127.0.0.1:11345
[Msg] Publicized address: 10.0.2.15
[Msg] Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
[Wrn] [FuelModelDatabase.cc:313] URI not supported by Fuel [model://buoy]
[Wrn] [SystemPaths.cc:459] File or path does not exist [""] [model://buoy]
Error Code 12 Msg: Unable to find uri[model://buoy]
[Msg] Loading world file [/home/goldfish/ros2_ws/src/my_underwater_sim/worlds/ocean.world]
[Err] [InsertModelWidget.cc:403] Missing model.config for model "/home/goldfish/.gazebo/models/client-11345"
[Err] [InsertModelWidget.cc:403] Missing model.config for model "/home/goldfish/.gazebo/models/server-11345"
[Err] [InsertModelWidget.cc:403] Missing model.config for model "/home/goldfish/.gazebo/models/server-11346"
[Wrn] [Event.cc:61] Warning: Deleting a connection right after creation. Make sure to save the ConnectionPtr from a Connect call
[Wrn] [Publisher.cc:135] Queue limit reached for topic /gazebo/underwater_world/physics/contacts, deleting message. This warning is printed only once.
[Wrn] [Visual.cc:1056] Unable to get Material[Gazebo/Underwater] for Geometry[ocean_floor::link::visual. Object will appear white
[Wrn] [Visual.cc:1056] Unable to get Material[Gazebo/Underwater] for Geometry[ocean_floor::link::visual. Object will appear white
[Wrn] [Visual.cc:1056] Unable to get Material[Gazebo/Water] for Geometry[water_surface::link::visual. Object will appear white
[Wrn] [Visual.cc:1056] Unable to get Material[Gazebo/Water] for Geometry[water_surface::link::visual. Object will appear white
context mismatch in svga_surface_destroy
context mismatch in svga_surface_destroy
[Wrn] [Publisher.cc:135] Queue limit reached for topic /gazebo/underwater_world/user_camera/pose, deleting message. This warning is printed only once.
AL lib: (EE) ALCpulsePlayback_contextStateCallback: Received context failure!
AL lib: (EE) ALCpulsePlayback_streamStateCallback: Received stream failure!
[Wrn] [Publisher.cc:135] Queue limit reached for topic /gazebo/underwater_world/pose/info, deleting message. This warning is printed only once.