rosdep fails while installing ros2 (crystal)in ubuntu xenial 16.04

asked 2019-05-27 05:53:04 -0500

narendarselva
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updated 2019-05-27 06:04:11 -0500

gvdhoorn
86574 ●283 ●1432 ●1054 http://cor.tudelft.nl/

It seems like python packages are missing .

root@dcrt-lnx-2:/home/Naren/ros2_ws# rosdep install --from-paths src --ignore-src --rosdistro crystal -y --skip-keys "console_bridge fastcdr fastrtps libopensplice67 libopensplice69 python3-lark-parser rti-connext-dds-5.3.1 urdfdom_headers"
ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
test_cli_remapping: No defi**nition of [python_cmake_module] for OS version [xen**ial]
rosidl_default_runtime: No definition of [rosidl_generator_py] for OS version [xenial]
test_cli: No definition of [python_cmake_module] for OS version [xenial]
rclpy: No definition of [rosidl_generator_py] for OS version [xenial]
test_communication: No definition of [python_cmake_module] for OS version [xenias

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How did you setup your workspace? Which instructions did you follow? Did you make sure to checkout the crystal versions of everything you cloned?

gvdhoorn ( 2019-05-27 06:06:27 -0500 )edit

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answered 2019-05-27 06:27:14 -0500

pavel92

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updated 2019-05-27 06:30:49 -0500

I had a similar issue when installing ROS2 from source alongside ROS1 kinetic. It looks like its due to rosdep using a wrong python version. You will need to set python3 by replacing #! /usr/bin/python with #! /usr/bin/python3 in /usr/bin/rosdep:

sudo nano /usr/bin/rosdep

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Are you sure about this? The error message essentially tells us that rosdep is unable to find a package named python_cmake_module either in the workspace or in the rosdep database. The pkgs that OP seems to be missing are all part of ros2/rosidl_python, so they should not be in the rosdep database, but in his workspace. It could be an incorrect set of packages was cloned.

Do you have a rationale for how changing the Python interpreter would influence this?

gvdhoorn ( 2019-05-27 06:32:29 -0500 )edit

I think you are right since my problem was that rosdep was not resolving keys for some ROS1 packages that it should not have found for ROS2. In the OP's case it is probably an incorrect set of packages as you suggested.

pavel92 ( 2019-05-27 07:11:59 -0500 )edit

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rosdep fails while installing ros2 (crystal)in ubuntu xenial 16.04

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