解决方案：gazebo-2] process has died [pid 28003, exit code 255, cmd /opt/ros/indigo/lib/

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在运行gazebo的过程中，出现了 黑屏 和下面的错误：

[gazebo-2] process has died [pid 28003, exit code 255, cmd /opt/ros/indigo/lib/gazebo_ros/gzserver worlds/empty.world __name:=gazebo __log:=/home/exbot/.ros/log/3bd6002c-c882-11e8-8b6c-000c299fff92/gazebo-2.log].
log file: /home/exbot/.ros/log/3bd6002c-c882-11e8-8b6c-000c299fff92/gazebo-2*.log

因为这个问题重装了几次gazebo的各个版本，最后在gazebosim上找到了解决方案，运行下面的命令即可：

killall gzserver

kilall gzclient

注：我测试的情况是，运行killall gzserver 就行了，再运行killall gzclient就会出错，但是上面描述的问题已经解决：