100% [Connecting to us.archive.ubuntu.com (91.189.91.15)] [Waiting for headers]Splitting up /var/lib/apt/lists/partial/archive.canonical.com_ubuntu_dists_utopicIgn http://archive.canonical.com utopic InRelease
Fetched 2,389 B in 0s (34.7 kB/s)
E: GPG error: http://archive.canonical.com utopic InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)