运行条件ubuntu-16.04ros-kinetic隔段时间运行roslaunch会如下错误[mavros_posix_sitl.launch]isneitheralaunchfileinpackage[px4]noris[px4]alaunchfilenameThetracebackfortheexceptionwaswrittentothelogfile解决：1.在Firmware下面打开终端,打开环境变量设置,查看为Firmware设置的路径$gedit~/.bashrc2.Firmware下新终端分别输入如下三条命令source~/Firmware/Tools/setup_gazeb