W:Failed to fetch http://ubuntu.mirror.garr.it/mirrors/ubuntu-archive/dists/trusty-updates/main/binary-amd64/Packages  Hash Sum mismatch
, W:Failed to fetch http://ubuntu.mirror.garr.it/mirrors/ubuntu-archive/dists/trusty-updates/universe/binary-amd64/Packages  Hash Sum mismatch
, W:Failed to fetch http://ubuntu.mirror.garr.it/mirrors/ubuntu-archive/dists/trusty-updates/main/binary-i386/Packages  Hash Sum mismatch
, W:Failed to fetch http://ubuntu.mirror.garr.it/mirrors/ubuntu-archive/dists/trusty-updates/universe/binary-i386/Packages  Hash Sum mismatch
, E:Some index files failed to download. They have been ignored, or old ones used instead.