In the process of using the Ubuntu operating system, you will generally encounter the problem of changing the software source. How to change the software source?
1. Graphical configuration-system configuration (recommended)
①Select-Show Application
②Select-Software and Updates
③Choose the appropriate software source
The software and update interface can also be called up through the terminal command - software-properties-gtk. Enter this command in the terminal and wait for a while, the software and update interface will pop up.
software-properties-gtk
2. Manual modification
The sources.list file can be modified manually. How to find this file? This file can be found using the find command. View the content of the file and you can see the information, bionic represents the version name.
The version name can be viewed through the command lsb_release -c.
lsb_release -c
You can also refer to the following to know the system name of ubuntu
When editing the sources.list file, please note that the version code of the software source must be consistent with the version code of Ubuntu. (Can be edited using vim commands).
Check whether the system version exists through the following URL. If it exists, it means it is still under maintenance.
http://archive.ubuntu.com/ubuntu/dists/If the corresponding version of your system cannot be found in the above URL, it means that it is beyond the scope of maintenance, that is, the version is too low. Although the expired version data source cannot be maintained, it has not been deleted. You can query the system version at the following URL
http://old-releases.ubuntu.com/ubuntu/dists/In other words, sources that are not updated can be replaced by old-releases. That is, replace the URL in the sources.list list.
The software source you find online must be consistent with your own version code , otherwise various error prompts given by apt will appear .
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reference:
https://blog.csdn.net/apple_51720004/article/details/125105945
https://blog.csdn.net/qq_45991026/article/details/119489948