Ubuntu20.04安装ros noetic错误解决

1、“curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | sudo apt-key add -” 报错：gpg: no valid OpenPGP data found

解决方法：

使用git镜像站的源地址https://raw.fastgit.org/ros/rosdistro/master/ros.asc替换https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc

2、sudo rosdep init 报错

报错内容：

ERROR: cannot download default sources list from:
https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list
Website may be down.

解决方法：

手动建立rosdep源的文件夹，等价于手动完成sudo rosdep init

sudo mkdir -p /etc/ros/ros