[gazebo-3] process has died [pid 26094, exit code 255, cmd /opt/ros/noetic/lib/gazebo_ros/gzserver -e ode /home/robot/PX4_Firmware/Tools/sitl_gazebo/worlds/empty.world __name:=gazebo __log:=/home/robot/.ros/log/09a65a14-b975-11ed-b4a4-c74ad1fd6683/gazebo-3.log].
log file: /home/robot/.ros/log/09a65a14-b975-11ed-b4a4-c74ad1fd6683/gazebo-3*.log
我在ubuntu20.04上搭建px4与gazebo的仿真的时候，碰到上面的问题
我这里是gzserver出问题，所以先关闭出问题的终端，执行
killall gzserver
之后可以正常运行
或者也可以加上下面的
killall gzclient