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Why install rolling sources for rosdep when using humble for ros_gz?

asked 2023-01-31 16:43:25 -0600

ryanf55 gravatar image


  • OS Version: Ubuntu 22.04 Jammy Source, humble commit 74dcf50afc0c487e0d6ef5da8c412ddb14762b30
  • Gazebo version - garden, installed with binaries as recommended


  • When installing rosdep sources, I would expect to install sources for the distro I am using.

Steps to reproduce

  1. Clone ros_gz
  2. Checkout the humble branch
  3. Run the supplied rosdep command rosdep install -y -r -q --from-paths src --ignore-src --rosdistro rolling


Rosdep specifies the following behavior for rosdistro. --rosdistro=ROS_DISTRO Explicitly sets the ROS distro to use, overriding the normal method of detecting the ROS distro using the ROS_DISTRO environment variable. When used with the 'update' verb, only the specified distro will be updated.

Is this intentional to install rolling sources even when using humble? If not, my recommendation would be this:

  1. Clone ros_gz
  2. Checkout your branch of choicde
  3. NEW - Source your ROS installation, whichever you choose. source /opt/ros/<ros_distro>/setup.bash
  4. Then, run rosdep without the rosdistro flag. Since the ROS WS was sourced before calling rosdep, it will use the appropriate distro for you automatically.

Even with the following, and after installing gazebo garden, I get the following errors on install.

rosdep install -y -r -q --from-paths src --ignore-src ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: ros_gz_image: Cannot locate rosdep definition for [gz-transport12] ros_gz_bridge: Cannot locate rosdep definition for [gz-transport12] ros_gz_sim_demos: Cannot locate rosdep definition for [gz-sim7] ros_gz_sim: Cannot locate rosdep definition for [gz-math7] Continuing to install resolvable dependencies... All required rosdeps installed successfully

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1 Answer

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answered 2023-02-03 13:24:17 -0600

azeey gravatar image

I think all references to rolling in the humble branch should be changed to humble. It was probably not updated after branching from rolling to humble. PRs would be appreciated.

Regarding the rosdep keys, gz-transport12 is not available form packages.ros.orgor from upstream Ubuntu repositories, so we can't add rosdep keys for it per You'll have to add the apt repo and install gz-transport12and any other Gazebo dependencies from there. Per the instruction in, the easiest thing would be to install gz-garden which will bring all the dependencies.

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Asked: 2023-01-31 16:34:52 -0600

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Last updated: Feb 03 '23