How to fix Ubuntu’s inability to resolve the regional d…

If you encounter issues resolving domain names while using apt to update in Ubuntu, you can try the following solution:

1. Check your network connection: Make sure your connection is working properly, you can try using the ping command to test if you can successfully access other websites.
2. Check the DNS configuration: Open the /etc/resolv.conf file and ensure that the DNS configuration is correct. You can use the following command to open the file:
3. Please open the file resolv.conf located in the etc directory using the nano editor with superuser privileges.
4. The file should include lines similar to the following:
5. Use the following DNS servers: 8.8.8.8 and 8.8.4.4.
6. If the DNS configuration is not correct, you can edit the file and add the correct DNS server address. After saving the file, try the apt update again.
7. Switching software sources: Sometimes, issues with software sources can result in not being able to resolve domain names. You can try switching to other reliable software sources to solve this problem. You can back up and switch software sources using the following command:
8. Make a backup of the sources.list file by copying it to sources.list.bak. Change the source from archive.ubuntu.com to mirrors.ubuntu.com in the sources.list file using sed. Update the apt package list.
9. If the problem still cannot be solved in this way, you can try switching to other trustworthy software sources.
10. Check your firewall settings: If you are using a firewall, it may be blocking apt from accessing the internet. Make sure to review your firewall settings to allow apt to pass through.

If the above methods fail to solve the problem, it may be caused by other reasons. You can try troubleshooting in various aspects, such as checking if the system time is correct and verifying if there are any other network issues.