rosinit error in 2022b on Linux

Hi,

I just installed the ROS toolbox in Matlab2022b in Ubuntu18.04, and type rosinit in the command window.

But it shows that:

Launching ROS Core...

Path to Python Executable is not set. Set the path to the Python executable using ROS Toolbox preferences.

Then I choose python3.9 in ROS Toolbox preferences.

But it told me that:

Invalid Python Version 3.9.15.Supported Python Version is 3.9.x.

Could anyone help me on figuring out this issue?

Thank you so much

Answer 1

[Jagadeesh Konakalla]

The error is confusing and our team is working to fix this issue. Can you please install 3.9.13 and try it? It will work.

Thanks,

Jagadeesh K

[鑫]

Thanks for your anwser!

I just installed python3.9.13, and run rosinit again.

This time it's shows that:

So what's wrong with it?Could you help me?

[Jagadeesh Konakalla]

Hi,

Can you try the following once ? Please run the following command in MATLAB.

ros.internal.createOrGetLocalPython(true)

Once the above command is complete, try the rosinit and let me know.

If the error persists, then it could be python installation issue. Please retry the Python installation.

Jagadeesh K

[鑫]

Thanks for your anwser.

I just tried this command,but it shows the same error.

Maybe I should check my Python installation.

Thanks again.

[James]

Were you able to check your Python installation to make sure it wasn’t compromised?

[鑫]

I just reinstalled python, but it seems useless. And I can't check out what's wrong. It's so weirdly.

[Karthik Reddy Vennapureddy]

Hi Jestzer,

Could you please provide the command you executed to install python? Regarding the above error:

ModuleNotFoundError: no module named '_ctypes'. Looks like libff-dev is not installed in your pc. Could you install libffi-dev using this command : sudo apt-get install libffi-dev

After installing libffi-dev, try rerunning 'ros.internal.createOrGetLocalPython(true)' and see if it works fine.

Thanks,

Karthik Reddy