Whenever I try to upgrade and update Ubuntu 20.04, the process gets failed. For example, when I execute a command sudo apt update I get [Waiting for headers]. After waiting for long time, terminal shows following message : Err:9 http://security.ubuntu.com/ubuntu bionic-security/main amd64 libcurl3-gnutls amd64 7.58.0-2ubuntu3.9 Connection failed [IP: xx.xxx.xx.xx 80]
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