尝试$ source ~/catkin_ws/devel/setup.bash,然后杀掉所有的gzserver进程,重新roslaunch试试?
$ source ~/catkin_ws/devel/setup.bash
答案来源:https://q.droid.ac.cn/t/topic/218
roslaunch卡死
原文:https://www.cnblogs.com/knightningwing/p/11458486.html