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To Fix Ubuntu sudo Error: unable to resolve host Add your hostname in /etc/hosts file. Subscribe our channel for more tech stuff. I searched for unity 3d on my windows 10 os . Curl error 6: Could not resolve host cpd.cloud.unity3d.com So I found your video.
The 520 error has to do with an error with your server that causes Cloudflare to not connect. When your site's visitors see error 520 in their browser, it means Cloudflare is sending the message because your server returned an empty, unknown, or unexpected response.