Ubuntu 19.04 trouble running apt update

I am trying to install phpmyadmin in Ubuntu 19.04 and got myself in the following trouble. Can anyone help me with it?

sudo apt update Hit:1 https://download.docker.com/linux/ubuntu bionic InRelease Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease                    Hit:3 https://repo.skype.com/deb stable InRelease                               Hit:4 http://security.ubuntu.com/ubuntu disco-security InRelease                Hit:5 http://repo.mysql.com/apt/ubuntu disco InRelease                          Hit:6 http://dl.google.com/linux/chrome/deb stable Release                      Hit:8 http://linux.teamviewer.com/deb stable InRelease                          Hit:9 http://archive.ubuntu.com/ubuntu disco InRelease                          Hit:10 http://packages.microsoft.com/repos/vscode stable InRelease              Err:11 http://in.mirrors.ustc.edu.cn/ubuntu disco InRelease                       Connection failed [IP: 80] Err:12 http://in.mirrors.ustc.edu.cn/ubuntu disco-updates InRelease   Connection failed [IP: 80] Err:13 http://in.mirrors.ustc.edu.cn/ubuntu disco-backports InRelease   Connection failed [IP: 80] Reading package lists... Done Building dependency tree        Reading state information... Done All packages are up to date. W: Failed to fetch http://in.mirrors.ustc.edu.cn/ubuntu/dists/disco/InRelease  Connection failed [IP: 80] W: Failed to fetch http://in.mirrors.ustc.edu.cn/ubuntu/dists/disco-updates/InRelease  Connection failed [IP: 80] W: Failed to fetch http://in.mirrors.ustc.edu.cn/ubuntu/dists/disco-backports/InRelease  Connection failed [IP: 80] W: Some index files failed to download. They have been ignored, or old ones used instead.