sudo rosdep init出現的錯誤

在系統上安裝ROS　

在運行

　sudo rosdep init　　

　　ERROR: default sources list file already exists:
　　/etc/ros/rosdep/sources.list.d/20-default.list
　　Please delete if you wish to re-initialize

分析原因：國內的長城防火牆，對數據進行了攔截無法獲取

解決方案１：

　　使用手機熱點。

　　sudo rosdep init　

　　rosdep update

　　總體的消耗的流量不多，並且一直成功。

解決方案２：

　　手動添加/etc/ros/rosdep/sources.list.d/20-default.list

　　在終端輸入：

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

   cd  /etc/ros/rosdep/sources.list.d

 　sudo gedit 20-default.list

　　添加如下內容：

　

# 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

之後運行：

　rosdep update

在運行的過程之中，也許還是會出現外網連接失敗，這個時候強烈建議使用“手機熱點”