Couldn't find executable named teleop_twist_keyboard.py

Question

There is a problem of'Couldn't find executable named teleop_twist_keyboard.py'. Having examed the package,the package was installed correctly.I have tried to edit the CMakeLists.txt file,but the file is read only.

Answer 1

1. Source you environment source /opt/ros/melodic/setup.bash
2. Try running without .py rosrun teleop_twist_keyboard teleop_twist_keyboard

It should work most probably else try running this: rospack list | grep teleop_twist_keyboard if you don't see anything its probably not installed properly.

UPDATE: The issue is with this command sudo ln -s /usr/bin/python3 /usr/bin/python, it creates a symlink between python and python3. But ROS melodic requires python2 not python 3. so you need to remove the symlink then install python 2 and create a symlink with python 2 and then run it again. I'll write the commands you need to follow.

• sudo rm /usr/bin/python to remove the symlink from python to python 3
• sudo apt install python2.7 check your /usr/bin/directory if python2 present skip to next step.
• sudo ln -s /usr/bin/python2 /usr/bin/python creates symlink with python2
• source /opt/ros/melodic/setup.bash source your ros env.
• rosrun teleop_twist_keyboard teleop_twist_keyboard.py

EXTRA:

user:~$ rosrun teleop_twist_keyboard teleop_twist_keyboard.py
Waiting for subscriber to connect to /cmd_vel
^CGot shutdown request before subscribers connected
user:~$ sudo ln -s /usr/bin/python3 /usr/bin/python
ln: failed to create symbolic link '/usr/bin/python': File exists
user:~$ sudo rm /usr/bin/python
user:~$ sudo ln -s /usr/bin/python3 /usr/bin/python
user:~$ rosrun teleop_twist_keyboard teleop_twist_keyboard.py
[rosrun] Couldn't find executable named teleop_twist_keyboard.py below /opt/ros/melodic/share/teleop_
twist_keyboard
user:~$ rospack list | grep teleop_twist_keyboard
teleop_twist_keyboard /opt/ros/melodic/share/teleop_twist_keyboard
user:~$ sudo rm /usr/bin/python
user:~$ sudo ln -s /usr/bin/python2 /usr/bin/python
user:~$ rosrun teleop_twist_keyboard teleop_twist_keyboard.py
Waiting for subscriber to connect to /cmd_vel
Waiting for subscriber to connect to /cmd_vel