[ROS installation problem] rosdep update fails and reports an error

[About ROS installation]

Due to the increasingly complex international situation, it has become quite difficult to follow the ROS installation process on the official wiki website. Here I recommend using the script written by the Yuxiang ROS boss for a one-click fool-proof installation:

wget http://fishros.com/install -O fishros && . fishros

[About rosdep failure]

This is an old problem, mainly caused by network reasons. Here is a method to solve it by modifying the software source.

Change the domestic mirror source: modify the foreign mirror source raw.githubusercontent.com to the domestic mirror source gitee.com

1. Directly modify the source code file

(1) The first step

sudo gedit /usr/lib/python2.7/dist-packages/rosdep2/sources_list.py

Original file content:

DEFAULT_SOURCES_LIST_URL = 'https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list'

change to:

DEFAULT_SOURCES_LIST_URL='https://gitee.com/ssonic/rosdistro/raw/master/rosdep/sources.list.d/20-default.list'

(2) The second step

sudo gedit /usr/lib/python2.7/dist-packages/rosdep2/gbpdistro_support.py

Original file content:

FUERTE_GBPDISTRO_URL = 'https://raw.githubusercontent.com/ros/rosdistro/master/releases/fuerte.yaml'

change to:

FUERTE_GBPDISTRO_URL = 'https://gitee.com/ssonic/rosdistro/raw/master/releases/fuerte.yaml'

(3) The third step

sudo gedit /usr/lib/python2.7/dist-packages/rosdep2/rep3.py

Source file content:

REP3_TARGETS_URL = 'https://raw.githubusercontent.com/ros/rosdistro/master/releases/targets.yaml'

change to:

REP3_TARGETS_URL = 'https://gitee.com/ssonic/rosdistro/raw/master/releases/targets.yaml'

(4) Step 4

sudo gedit /usr/lib/python2.7/dist-packages/rosdistro/__init__.py

Original file content:

DEFAULT_INDEX_URL = 'https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml'

change to:

DEFAULT_INDEX_URL = 'https://gitee.com/ssonic/rosdistro/raw/master/index-v4.yaml'

2. After making the changes, execute the command again

sudo rosdep init

Note: If an error occurs, delete the 20-default.list file first

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

3. Finally execute rosdep update

[Related questions about Gazebo]

(1) Unable to simulate the GPU version of lidar? ---- > Upgrade Gazebo to version 9.4.0

sudo sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/gazebo-stable.list'
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys D2486D2DD83DB69272AFE98867170598AF249743
sudo apt update
sudo apt upgrade

（2）[Err] [REST.cc:205] Error in REST request during startup gazebo

gedit ~/.ignition/fuel/config.yaml

修改这一句：
url: https://api.ignitionfuel.org

为
url: https://api.ignitionrobotics.org