ubuntu18.04安装ROS解决安装中rosdep init 和rosdep update失败的方法(2021.10.10)

方法一:

一、 解决rosdep_init问题

正常执行sudo rosdep init会报错，如下：

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.

解决方案：

此解决方案的原理是基于手动完成sudo rosdep init的步骤，然后再通过rosdep update完成整个方案的实施。

步骤一：首先打开一个终端

sudo mkdir -p /etc/ros/rosdep/sources.list.d

cd /etc/ros/rosdep/sources.list.d

sudo gedit 20-default.list

步骤二：将以下内容复制进20-default.list文件中

# 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

步骤三：执行以下指令

rosdep update（一般会失败，请继续看下文）

参考资料：https://www.guyuehome.com/12640

二、 解决rosdep_update问题

由于近期国内Github Raw的可用IP越来越少，通过修改hosts文件解决rosdep update超时问题的方法已经不太好用，本文通过修改rosdep源码中下载资源的函数来解决这一问题。

网站https://ghproxy.com/支持github的资源代理，非常好用，我们将用此代理加速rosdep对Github Raw的访问，进而