【解决问题】RLException: [xx.launch] is neither a launch file in package [x] nor is [x] a launch file name

看网上很多大神都是进入bashrc修改或者添加代码但是好多没啥用，亲测一种方法如下。

这种方法不需要每次编写都添加环境变量了。

首先打开这个文件：

sudo  gedit ~/.bashrc

在该文件的最后添加如下代码
ros_workspace为我的ROS工作路径。

source ~/ros_workspace/devel/setup.bash

export ROS_PACKAGE_PATH=${ROS_PACKAGE_PATH}:~/ros_workspace/src

然后重启bashrc

source ~/.bashrc

查看ROS路径是否添加上

echo $ROS_PACKAGE_PATH

设置成功会显示你添加的路径。

但是又报错

主要解决办法如下：
1、joint_state_publisher_gui是刚更新出来的包，需要把之前的joint_state_publisher换成joint_state_publisher_gui
2、输入下面的命令

sudo apt-get install ros-melodic-joint-state-publisher-gui

如果是kinetic版本的

sudo apt-get install ros-kinetic-joint-state-publisher-gui

下载完成之后

再次运行

暂时没有报错。

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【解决问题】RLException: [xx.launch] is neither a launch file in package [x] nor is [x] a launch file name

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