ROS Error

ros-kinetic-desktop-full 有未满足的依赖关系

解决方法：
打开终端，然后输sudo gedit /etc/apt/sources.list回车，打开文件后，修改，保存
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse

之后输入：

sudo apt-get update

更新源。

注意后面增加的 universe multiverse
main restricted universe multiverse 这是按软件的自由度来区分的

main:完全的自由软件。
restricted:不完全的自由软件。
universe:ubuntu官方不提供支持与补丁，全靠社区支持。
muitiverse：非自由软件，完全不提供支持和补丁。

catkin_make

当输入 catkin_make 时，出现错误信息：
Error:The specified base path “/home/ubuntu/catkin_ws” contains a CMakeLists.txt but “catkin_make” must be invoked in the root of workspace.
出现这种情况的原因是catkin_init_workspacce的时候，出现下面这句：
Creating symlink “/home/ubuntu/catkin_ws/CMakeLists.txt” pointing to “/opt/ros/indigo/share/catkin/cmake/toplevel.cmake”
将当前工作空间下的CMakeLists.txt与/ros/下的cmake做了链接。

解决方法：

unlink /home/ubuntu/catkin_ws/CMakeLists.txt 

或者直接把 ~/catkin_ws/ 下的 CMakeLists.txt 文件删除就好了。

ERROR:default sources list file already exists

当输入 rospack 查询包的依赖时

然后输入 sudo rosdep init
出现如下错误

通常这是因为之前曾经安装过ROS系统的某个版本，只需按照提示删除已经存爱的初始化文件即可。

sudo rm /etc/ros/rosdep/source.list.d/20-default.list

然后再重新运行 sudo rosdep init

ERROR:cannot download default sources list

输入 sudo rosdep init 时，出现错误

有可能是没有安装证书库所致，可以尝试如下命令：

sudo apt-get install ca-certificates

其实这个文件也比较简单，这一行所做的命令只是下载这个文件放到 /etc/ros/rosdep/sources.list.d/20-default.list 下面，因此你也可以自行保存下面的内容：

# os-specific listings first
yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml osx

# generic
yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml
yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml
yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml
gbpdistro https://raw.githubusercontent.com/ros/rosdistro/master/releases/fuerte.yaml fuerte

# newer distributions (Groovy, Hydro, ...) must not be listed anymore, they are being fetched from the rosdistro index.yaml instead

然后你可以运行：
rosdep update