Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

Introduction to tf2 on NOETIC

asked 2021-11-15 05:23:40 -0600

Ktysai
112 ●7 ●20 ●16

Hi there!

i was trying to learn more about TF2, but running the

roslaunch turtle_tf2 turtle_tf2_demo.launch

it is obtained

Use arrow keys to move the turtle. 'q' to quit.
process[turtle_pointer-6]: started with pid [2221]
/usr/bin/env: ‘python’: No such file or directory
[turtle1_tf2_broadcaster-4] process has died [pid 2210, exit code 127, cmd /opt/ros/noetic/lib/turtle_tf2/turtle_tf2_broadcaster.py __name:=turtle1_tf2_broadcaster __log:=/home/vivio/.ros/log/2f5f5452-4605-11ec-acdb-556470342d91/turtle1_tf2_broadcaster-4.log].

I guess the the line regarding python is important "/usr/bin/env: ‘python’:" In Ubuntu 20.04 Python3 is default. I have to find the file of turtlesim and add "/usr/bin/env: python3"?

Thank you!

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2021-11-15 06:17:29 -0600

Ktysai
112 ●7 ●20 ●16

updated 2021-11-15 06:18:05 -0600

I've found several solutions:

Create a symlink between python & python3
use sudo apt-get install python-is-python3, but I'm not sure if it creates just a symlink
The solution I have adopted after testing all 3:

Go to /opt/ros/noetic/lib/turtle_tf2 and modify the first line in f all the python files there #!/usr/bin/env python to #!/usr/bin/env python3. Credits go to https://github.com/ros/geometry_tutor...