python3-pykdl] defined as "not available" for OS version [bionic]

[islemhm]

hello ihave a problem when i run ''''rosdep install -y --from-paths . --ignore-src --rosdistro melodic''' it show me this error """"ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
tf2_geometry_msgs: [python3-pykdl] defined as "not available" for OS version [bionic]
tf2_sensor_msgs: [python3-pykdl] defined as "not available" for OS version [bionic]
amcl: [python3-pykdl] defined as "not available" for OS version [bionic]
"""" any one can help me plzz i use ubuntu 18.04 and ros melodic

[schmittlema]

Hi @islemhm! What package are you trying to install dependencies for? This command I don't think is used anywhere in our tutorials, so it may not work as expected. That being said, it seems your default python version it set to python3 which is not compatible with melodic. The installer is trying to find python3-pykdl which does not exist for bionic. There is a python2 version that it should be trying to install, but for some reason it thinks it should install the python3 version.

[islemhm]

@planc509 no it doesn't fix it, it still the same problem

[palanc]

Are you still getting the exact same error message as in your original post?

Also, what is the output of this command:

python --version

[islemhm]

@planc509 when i run :python --version
Python 2.7.17
yes it still the same error msg

[palanc]

Sorry I'm not sure why it is still referencing python3-dkl if you are using python 2 now. Unless anyone else here has ideas, maybe you could try contacting the maintainers of moveit to see if they have seen this problem before?

[islemhm]

@planc509 thank you for your help