Connection failed during installation of ros2 [ip: 91.189.91.39 80]

virtual machine ROS2 The following errors appear during installation ：

E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/freeglut/freeglut3_2.8.1-6_amd64.deb Connection failed [IP: 91.189.91.39 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/flann/libflann1.9_1.9.1%2bdfsg-11_amd64.deb Connection failed [IP: 91.189.91.39 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/flann/libflann-dev_1.9.1%2bdfsg-11_amd64.deb Connection failed [IP: 91.189.91.38 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/fmtlib/libfmt8_8.1.1%2bds1-2_amd64.deb Connection failed [IP: 91.189.91.39 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/fyba/libfyba0_4.1.1-7_amd64.deb Connection failed [IP: 91.189.91.38 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/fyba/libfyba-dev_4.1.1-7_amd64.deb Connection failed [IP: 91.189.91.39 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/freexl/libfreexl1_1.0.6-1_amd64.deb Connection failed [IP: 91.189.91.38 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/fmtlib/libfmt-dev_8.1.1%2bds1-2_amd64.deb Connection failed [IP: 91.189.91.39 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/freexl/libfreexl-dev_1.0.6-1_amd64.deb Connection failed [IP: 91.189.91.38 80]
E: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/pool/universe/f/fonttools/python3-fonttools_4.29.1-2build1_amd64.deb Connection failed [IP: 91.189.91.39 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

resolvent

1、 To analyze problems , Try to solve it yourself according to the prompts

   The last sentence of the question ：Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? The translation means ： Unable to get some archives , Maybe run apt-get update Or add --fix-missing Try again （ It can be solved ）. They refer to the following two instructions respectively ：

sudo apt-get update
sudo apt-get update --fix-missing

2、 Not solve , Check for network problems

   If you run the above two instructions, it still won't work （ Mine just can't ）, Refer to the information you can find on the Internet , Most of them say that they need to be modified DNS Address . When I started revising , Think about it , Why the original DNS Can not use , Just remembered What I connect is generated by the router relay WiFi（WiFi The names are different ）, Is it possible that this is the reason why the connection to the website is wrong . I changed to one without relay WiFi, I did it again , Found no error , Problem solved .
   If you are not in the above situation , You can try it Use mobile data to open hot spots , Computers are directly connected to broadband with network cables Other methods , If it doesn't work , Try the following method .

3、 modify DNS Address or modify software source

   If the above method cannot be solved , It can only be modified online DNS And the method of modifying the software source . In order to better solve this problem , I specially summarized DNS A summary of the modification methods of and software sources , You can refer to it ： DNS Summary of address modification and software source modification
   ad locum , I take ubuntu22.04 For example , According to the content of the above article , The following two solutions are given ：

3.1 modify DNS Address

   Because to solve this problem, we only need to modify it temporarily DNS Address , So here we modify DNS Client configuration file , I.e. modification /etc/resolv.conf file .
  （1）echo Instructions covering resolv.conf The contents of the document （ Yes vim Skilled editor , It can also be used. vim open resolv.conf File modification ）

sudo echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null

  （2） Check whether the file is modified successfully
   Mode one ： Terminal mode view ：

cat /etc/resolv.conf

   Mode two ： Text view ：

cat /etc/resolv.conf

  （3） Renew

sudo apt-get update --fix-missing

If it's installation ROS2, You can also re execute ROS2 Installation instructions ：

sudo apt install ros-humble-desktop

Basically, the above steps can solve the problem of Title , If not , You can only try to modify the software source .

3.2 Modify software source

  （1） Back up the files to be modified

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

  （2） Open with text editor sources.list file

sudo gedit /etc/apt/sources.list

  （3） Replace the contents of the document with the following , Then save to exit

#  Tsinghua University open source software image station  Ubuntu22.04  Mirror source 
#  The source image is annotated by default to improve  apt update  Speed , If necessary, please cancel the comment 
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted universe multiverse

#  Open source software mirror station of University of science and technology of China  Ubuntu22.04  Mirror source 
#  The source repository is annotated by default , If necessary, please cancel the comment 
deb https://mirrors.ustc.edu.cn/ubuntu/ jammymain restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse

#  Alibaba cloud open source software image station  Ubuntu22.04  Mirror source 
deb http://mirrors.aliyun.com/ubuntu/ jammymain restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
# deb http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse

PS: For other versions , hold jammy Just change to another version code : 22.04：jammy;20.04：focal;18.04：bionic;16.04：xenial.

  （4） Check whether the software source is loaded successfully

#  Check for updates 
sudo apt-get update 
#  Update software 
sudo apt-get upgrade 

   If there is no problem with the software source , You can update again

sudo apt-get update --fix-missing
sudo apt install ros-humble-desktop

   Reference material ：
  1、【Linux To configure 】E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
  2、DNS Summary of address modification and software source modification （ be based on ubuntu22.04）