Ubuntu18.04运行gazebo的launch文件[model-4] process has died报错
启动gazebo仿真环境报错[model-4] process has died
[model-4] process has died [pid 2059, exit code 1, cmd /opt/ros/melodic/lib/gazebo_ros/spawn_model -urdf -model mycar -param robot_description __name:=model __log:=/root/.ros/log/8842dc14-877c-11ee-a9d9-0242ac110002/model-4.log].
log file: /root/.ros/log/8842dc14-877c-11ee-a9d9-0242ac110002/model-4*.log
出现报错原因：
ubuntu18.04版本在launch文件中添加中文注释有可能导致这个错误。
解决方法：
主要是编码老问题，找到上面出现的/usr/lib/python2.7/xml/etree/ElementTree.py文件，使用vim文本编辑器打开，终端命令是
sudo vim /usr/lib/python2.7/xml/etree/ElementTree.py加入以下代码
reload(sys)
sys.setdefaultencoding("utf-8")加入之后的程序格式如下：
