err:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
   Temporary failure resolving 'us.archive.ubuntu.com'
err:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease
   Temporary failure resolving 'us.archive.ubuntu.com'
err:3 http://us.archive.ubuntu.com/ubuntu xenial-security InRelease
   Temporary failure resolving 'security.ubuntu.com'
err:4 http://archive.canonical.com xenial InRelease
   Temporary failure resolving 'archive.canonical.com'
err:5 http://ppa.launchpad.net/bumblebee/testing/ubuntu xenial InRelease
   Temporary failure resolving 'ppa.launchpad.net'
err:6 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu xenial InRelease
   Temporary failure resolving 'ppa.launchpad.net'
err:7 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial InRelease
   Temporary failure resolving 'ppa.launchpad.net'
err:8 http://linux.dropbox.com/ubuntu wily InRelease
   Temporary failure resolving 'linix.dropbox.com'
err:9 http://dl.google.com'linux/chrome/deb stable InRelease
   Temporary failure resolving 'dl.google.com'
err:10 http://packages.ros.org/ros/ubuntu xenial InRelease
   Temporary failure resolving 'packages.ros.org'
err:11 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease
   Temporary failure resolving 'us.archive.ubuntu.com'