title: how to solve W:Some index files failed to download. They have been ignored, or old ones used instead
body: <p><strong>I use</strong> <em>Ubuntu 18.04.4</em> <strong>and when I run "sudo apt-get update", I get the following error.</strong></p>
  
  <pre><code>Err:1 http://repo.mysql.com/apt/ubuntu bionic InRelease                        
    Could not connect to repo.mysql.com:80 (23.213.169.17), connection timed out
  Err:2 http://ny-mirrors.evowise.com/ubuntu bionic InRelease                    
    Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:4b3). - connect (101: Network is unreachable) Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:5b3). - connect (101: Network is unreachable) Could not connect to ny-mirrors.evowise.com:80 (104.22.5.179), connection timed out Could not connect to ny-mirrors.evowise.com:80 (104.22.4.179), connection timed out
  Err:3 http://ny-mirrors.evowise.com/ubuntu bionic-updates InRelease            
    Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:4b3). - connect (101: Network is unreachable) Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:5b3). - connect (101: Network is unreachable)
  Err:4 http://ny-mirrors.evowise.com/ubuntu bionic-backports InRelease          
    Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:4b3). - connect (101: Network is unreachable) Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:5b3). - connect (101: Network is unreachable)
  Err:5 http://ny-mirrors.evowise.com/ubuntu bionic-security InRelease           
    Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:4b3). - connect (101: Network is unreachable) Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:5b3). - connect (101: Network is unreachable)
  Err:6 http://ppa.launchpad.net/samoilov-lex/aftl-stable/ubuntu artful InRelease
    Cannot initiate the connection to ppa.launchpad.net:80 (2001:67c:1560:8008::15). - connect (101: Network is unreachable) Could not connect to ppa.launchpad.net:80 (91.189.95.83), connection timed out
  Err:7 http://ppa.launchpad.net/vikoadi/ppa/ubuntu bionic InRelease             
    Cannot initiate the connection to ppa.launchpad.net:80 (2001:67c:1560:8008::15). - connect (101: Network is unreachable)
  Err:8 http://packages.microsoft.com/repos/vscode stable InRelease
    Connection failed [IP: 104.214.230.139 80]
  Err:9 http://archive.canonical.com/ubuntu bionic InRelease
    Connection failed [IP: 91.189.91.15 80]
  Reading package lists... Done
  W: Failed to fetch http://ny-mirrors.evowise.com/ubuntu/dists/bionic/InRelease  Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:4b3). - connect (101: Network is unreachable) Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:5b3). - connect (101: Network is unreachable) Could not connect to ny-mirrors.evowise.com:80 (104.22.5.179), connection timed out Could not connect to ny-mirrors.evowise.com:80 (104.22.4.179), connection timed out
  W: Failed to fetch http://ny-mirrors.evowise.com/ubuntu/dists/bionic-updates/InRelease  Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:4b3). - connect (101: Network is unreachable) Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:5b3). - connect (101: Network is unreachable)
  W: Failed to fetch http://ny-mirrors.evowise.com/ubuntu/dists/bionic-backports/InRelease  Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:4b3). - connect (101: Network is unreachable) Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:5b3). - connect (101: Network is unreachable)
  W: Failed to fetch http://archive.canonical.com/ubuntu/dists/bionic/InRelease  Connection failed [IP: 91.189.91.15 80]
  W: Failed to fetch http://ny-mirrors.evowise.com/ubuntu/dists/bionic-security/InRelease  Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:4b3). - connect (101: Network is unreachable) Cannot initiate the connection to ny-mirrors.evowise.com:80 (2606:4700:10::6816:5b3). - connect (101: Network is unreachable)
  W: Failed to fetch http://ppa.launchpad.net/samoilov-lex/aftl-stable/ubuntu/dists/artful/InRelease  Cannot initiate the connection to ppa.launchpad.net:80 (2001:67c:1560:8008::15). - connect (101: Network is unreachable) Could not connect to ppa.launchpad.net:80 (91.189.95.83), connection timed out
  W: Failed to fetch http://repo.mysql.com/apt/ubuntu/dists/bionic/InRelease  Could not connect to repo.mysql.com:80 (23.213.169.17), connection timed out
  W: Failed to fetch http://ppa.launchpad.net/vikoadi/ppa/ubuntu/dists/bionic/InRelease  Cannot initiate the connection to ppa.launchpad.net:80 (2001:67c:1560:8008::15). - connect (101: Network is unreachable)
  W: Failed to fetch http://packages.microsoft.com/repos/vscode/dists/stable/InRelease  Connection failed [IP: 104.214.230.139 80]
  W: Some index files failed to download. They have been ignored, or old ones used instead.
  </code></pre>
  
  <p>I tried some solution but nothing help.  </p>