Fix Ubuntu DNS Not Resolving Host

If Ubuntu is unable to resolve host addresses, it is usually due to incorrect DNS configurations or networking issues.

Here are some possible solutions:

1. Check DNS configuration: Ensure that the DNS configuration of Ubuntu is correct by checking and editing the DNS server address in the /etc/resolv.conf file.
2. Check network connection: Make sure Ubuntu can connect to the Internet properly. You can try using the ping command to test if the network connection is working correctly.
3. Restarting the network service: You can try restarting the network service to attempt to resolve the issue, by using the command sudo service networking restart to restart the network service.
4. Switch to a different DNS server: If there are issues with your current DNS server, you can try using a different public DNS server.
5. Check hostname resolution: Verify that hostnames and IP addresses are resolving correctly by using the command nslookup to find the mapping between hostnames and IP addresses.

If none of the above methods work, you can try reconfiguring the network settings or contacting the network administrator for assistance.