A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry.


W:Failed to fetch http://archive.linux.duke.edu/ubuntu/dists/xenial-security/main/binary-amd64/Packages  Hash Sum mismatch
, W:Failed to fetch http://archive.linux.duke.edu/ubuntu/dists/xenial-updates/main/binary-i386/Packages  Hash Sum mismatch
, W:Failed to fetch http://archive.linux.duke.edu/ubuntu/dists/xenial-updates/universe/binary-i386/Packages  Hash Sum mismatch
, E:Some index files failed to download. They have been ignored, or old ones used instead.