How to solve DNS_PROBE_FINISHED_NXDOMAIN in Ubuntu

1. Open your wifi settings. Press the windows button, then type in wifi. 

2. Click on the cog button to open the settings window.

3. Go to the IPV4 tab, disable the "automatic" option. Then add values to the DNS. If you wish to add multiple DNS resolvers, then be sure to separate them with a comma. Here are common DNS resolvers:

- Google (8.8.8.8, 8.8.4.4)

- Cloudflare (1.1.1.1 and 1.0.0.1)

- OpenDNS (208.67.222.222, 208.67.220.220)

- Level3 (209.244.0.3, 209.244.0.4)

4. Finally click on "Apply".

5. Open the terminal and type in the following:

sudo service network-manager restart

6. This will restart your network manager. Finally, refresh your browser and the DNS_PROBE_FINISHED_NXDOMAIN error should disappear.