ubuntu18.04 ROS编译ROS-Academy-for Beginners包常见错误及gazebo的瞎搞之路
错误：
Could not find a package configuration file provided by "move_base"
解决办法：
sudo apt-get install ros-melodic-navigation
安装对应的包即可。
解决办法：
sudo apt-get install ros-melodic-slam-karto
解决办法：
source ~/ros_class/devel/setup.bash
或者
echo "source ~/ros_class/devel/setup.bash" >> ~/.bashrc
解决办法：
sudo apt install cmake gcc g++ qt{4,5}-qmake libqt4-dev
关于这个包编译一直出各种各样的bug的原因是我没有按照操作指南再catkin_make之前先安装依赖,就是那一句
rosdep install --from-paths src --ignore-src --rosdistro=melodic -y
这一句的作用就是安装各种依赖啊，粗心、瞎搞就是我，根据bug一点一点修正真的很累啊，gazebo的加载一直有问题，大片大片的error,心累，最后领导给我的一句话就是，拿到一个东西，首先看README.txt 。
记录gazebo能重新正常启动的过程
错误1：
[gazebo -2]
尝试升级gazebo至9.10.0
sudo apt-get update
sudo apt-get install gazebo9
出现错误
gazebo: symbol lookup error
解决办法：终端输入
sudo apt upgrade libignition-math2
成功升级到gazebo9.10.0,但是在运行
roslaunch robot_sim_demo robot_spawn.launch
出现错误
[gazebo -1]
卸载gazebo,
sudo apt-get remove gazebo*
重新安装gezebo
sudo apt-get update
sudo apt install gazebo9
成功安装gazebo9.10.0,在catkin_make时出错
Could not find a package configuration file provided by "gazebo_ros" with
any of the following names:
gazebo_rosConfig.cmake
gazebo_ros-config.cmake
Add the installation prefix of "gazebo_ros" to CMAKE_PREFIX_PATH or set
"gazebo_ros_DIR" to a directory containing one of the above files. If
"gazebo_ros" provides a separate development package or SDK, be sure it has
been installed.
按照提示安装gazebo_ros(这个应该是单独卸载gazebo又重装gazebo和ros未链接出现的问题）
sudo apt-get install ros-melodic-gazebo-ros
catkin_make通过，再启动launch文件出现错误
[gazebo -2]
参照网上操作，执行
killall gzserver
能正常启动gazebo模型