在进行ROS编译 catkin_make 时，缺少数据包文件 std_msgs
bruce@bruce-desktop:~/catkin_ws$ catkin_make
出现错误
CMake Error at /opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:83 (find_package):Could not find a package configuration file provided by "std-msgs" with anyof the following names:std-msgsConfig.cmakestd-msgs-config.cmakeAdd the installation prefix of "std-msgs" to CMAKE_PREFIX_PATH or set"std-msgs_DIR" to a directory containing one of the above files. If"std-msgs" provides a separate development package or SDK, be sure it hasbeen installed.
Call Stack (most recent call first):test_pkg/CMakeLists.txt:10 (find_package)-- Configuring incomplete, errors occurred!
See also "/home/bruce/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/bruce/catkin_ws/build/CMakeFiles/CMakeError.log".
Makefile:320: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed
因为缺少文件，（亲测），
从新安装一遍ROS，
不必卸载原来的ROS，再编译，问题解决。
还有遇见的一些主要问题：
问题1：
bruce@bruce-desktop:~$ sudo rosdep initERROR: default sources list file already exists:/etc/ros/rosdep/sources.list.d/20-default.list
Please delete if you wish to re-initialize
按要求删除文件
bruce@bruce-desktop:~$ su root
Password: root@bruce-desktop:/home/bruce# pwd
/home/bruceroot@bruce-desktop:/# cd /etc/ros/rosdep/sources.list.d/
root@bruce-desktop:/etc/ros/rosdep/sources.list.d# ls -l
total 4
-rw-r--r-- 1 root root 588 11月 25 19:11 20-default.list
root@bruce-desktop:/etc/ros/rosdep/sources.list.d# rm 20-default.list
root@bruce-desktop:/etc/ros/rosdep/sources.list.d# 问题2：
再次创建 test_pkg文件时，出现一些错误，按照提示，删除相应文件即可。
bruce@bruce-desktop:~/catkin_ws$ cd src
bruce@bruce-desktop:~/catkin_ws/src$ catkin_create_pkg test_pkg std_msgs rospy roscppusage: catkin_create_pkg [-h] [--meta] [-s [SYS_DEPS [SYS_DEPS ...]]][-b [BOOST_COMPS [BOOST_COMPS ...]]] [-V PKG_VERSION][-D DESCRIPTION] [-l LICENSE] [-a AUTHOR][-m MAINTAINER] [--rosdistro ROSDISTRO]name [dependencies [dependencies ...]]
catkin_create_pkg: error: File exists: /home/bruce/catkin_ws/src/test_pkg/CMakeLists.txt
bruce@bruce-desktop:~/catkin_ws/src$