An apt-get update is stuck saying “Waiting for headers”?
Wait a bit to make sure it’s actually stuck. The DebTorrent downloads occur sequentially and can be quite slow. They also give no indication of the status of their download, so be patient. If, after waiting a while nothing happens, or APT times out and says an error occurred, you may want to try enabling debugging in APT to determine which download is timing out (it may not be a DebTorrent download, but just a stalled download from a slow mirror). See BugReporting for how to enable debugging in APT.