roslaunch turtle_tf turtle_tf_demo.launch 出现 [turtle_pointer-6] process has died when running tf tutorial

将默认python版本从2改到3，步骤如下：

https://www.fosslinux.com/39384/switching-between-python-2-and-3-versions-on-ubuntu-20-04.htm

 

 上述设置完成后，使用如下命令更改默认Python版本：

 

$ sudo update-alternatives --config python

　

依然不能解决，参考：

https://answers.ros.org/question/45251/turtle_pointer-6-process-has-died-when-running-tf-tutorial/