I don't know how many times I have installed ROS. Due to learning needs, I installed ROS for the new machine again, but I was tortured by installation errors for a long time. In order to prevent the time-consuming whole network search for solutions when reinstalling, this paper is going to record the installation process and collect various solutions on the network.
2, Install ROS
1. Software source settings
① Check the source code option in 'settings -- > software and updates -- > Ubuntu software' and change the software source to domestic.
② Add ROS software source
sudo sh -c '. /etc/lsb-release && echo "deb http://mirrors.tuna.tsinghua.edu.cn/ros/ubuntu/ $DISTRIB_CODENAME main" > /etc/apt/sources.list.d/ros-latest.list'
2. Set public key
sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
3. Install ROS
sudo apt-get update sudo apt-get install ros-melodic-desktop-full sudo apt-get install ros-melodic-rqt* sudo apt-get install python-rosdep
4. Initialize ROS
sudo rosdep init rosdep update
5. Test ROS
The problems in installing ROS basically appear in step 4 of installation.
1. Problem 1: sudo rosdep init execution error. This error is usually caused by the wall.
~$ sudo rosdep init 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.
Scheme 1: add the ip address of raw.githubusercontent.com. Don't add it according to the ip address on the Internet. It's already out of date. get into The Best IP Address, Email and Networking Tools - IPAddress.com ， Enter raw.githubusercontent.com in the search box and search to get the IP address.
sudo gedit /etc/hosts #e.g add 184.108.40.206 raw.githubusercontent.com at the end of the file sudo rosdep init
Continue with the instructions in step 4 of the installation. I solved the problem according to this scheme.
Scheme 2: refer to teacher Gu Yueju
sudo c_rehash /etc/ssl/certs sudo -E rosdep init
Scheme 3: reference users
sudo apt-get install ca-certificates sudo rosdep init
Scheme 4: if you can't, just surf the Internet scientifically.
2. Question 2: rosdep update There is an error in execution. Either Hit cannot find the corresponding yaml file, or time out.
Scheme 1: refer to scheme 1 of question 1. If the normal ip address is changed, the following steps can run normally.
Scheme 2: Download and save the corresponding yaml file locally.
Referring to the blogger's scheme, this scheme is more complex, but 99.9% can solve the problem. Ubuntu 18.04 experience of installing ROS and the method of 100% solving the error of rosdep update_ m0_59218577 blog - CSDN blog insert code slice herehttps://blog.csdn.net/m0_59218577/article/details/118344779?utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.no_search_link&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.no_search_link
The whole installation tutorial is still relatively simple. I hope it can be helpful. After climbing a mountain, you will see the next peak.