Fix Debian Repository Switching Errors

If you are unable to complete updates or exit after changing software sources in a Debian system, you can try the following methods to resolve the issue:

1. Restore default sources: Restoring the software sources to their original state may solve the problem. You can edit the /etc/apt/sources.list file, change all sources back to the default official sources, and save the file before running the command sudo apt-get update to update the software list.
2. Disable or remove problematic sources: If only a specific source is causing issues, you can edit the /etc/apt/sources.list file and comment out or delete that source, then run the sudo apt-get update command to update the software list.
3. You can use graphical interface tools on the Debian system to help manage software sources, such as software-properties-gtk. These tools can be used to add, remove, or modify software sources.
4. Check your network connection: Sometimes, the inability to connect to a software source may be due to network problems. You can verify that your network connection is working properly by running the ping command in the terminal to test if the software source is accessible.

If the above methods still do not solve the problem, you can try searching for relevant error information or seek help on the Debian community forum or reach out to the official Debian support team.