I upped the verbosity of the duplicity command, and here is the Python
backtrace of the read operation timeout:

Level 1:duplicity:Backtrace of previous error: Traceback (innermost last):
  File "/usr/lib/python2.7/dist-packages/duplicity/backends/u1backend.py", line 
80, in request
    resp, content = self.client.request(url, method, headers=headers, body=body)
  File "/usr/lib/python2.7/dist-packages/httplib2/__init__.py", line 1596, in 
request
    (response, content) = self._request(conn, authority, uri, request_uri, 
method, body, headers, redirections, cachekey)
  File "/usr/lib/python2.7/dist-packages/httplib2/__init__.py", line 1344, in 
_request
    (response, content) = self._conn_request(conn, request_uri, method, body, 
headers)
  File "/usr/lib/python2.7/dist-packages/httplib2/__init__.py", line 1314, in 
_conn_request
    response = conn.getresponse()
  File "/usr/lib/python2.7/httplib.py", line 1045, in getresponse
    response.begin()
  File "/usr/lib/python2.7/httplib.py", line 409, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.7/httplib.py", line 365, in _read_status
    line = self.fp.readline(_MAXLINE + 1)
  File "/usr/lib/python2.7/socket.py", line 476, in readline
    data = self._sock.recv(self._rbufsize)
  File "/usr/lib/python2.7/ssl.py", line 298, in recv
    return self.read(buflen)
  File "/usr/lib/python2.7/ssl.py", line 217, in read
    return self._sslobj.read(len)
 SSLError: The read operation timed out

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to deja-dup in Ubuntu.
https://bugs.launchpad.net/bugs/1161599

Title:
  Backup to Ubuntu one failed, after 5 attempts status 400 bad request

Status in “deja-dup” package in Ubuntu:
  Confirmed
Status in “duplicity” package in Ubuntu:
  New

Bug description:
  On Raring using deja-dup to backup to Ubuntu one, when I add a particular git 
repository to the folders to backup and then start the backup, the process sits 
for some minutes at the start of the upload operation and then fails with a 
popup "Backup Failed. Giving up on request after 5 attempts last status 400 bad 
request".  The progress bar does not get started as far as I can see.
  While it is saying that it is uploading I can see in System Monitor that data 
is being continuously sent, but after the failure there are no new files on U1.

  By a process of elimination I determined that it is the objects
  directory (which itself contains a large number of subdirectories each
  containing a number of small files) that is causing the problem.  I
  attempted to determine whether it was a particular file or folder that
  was causing the problem but it seems not to be consistent.  I thought
  that I had found a particular subfolder causing the problem, I cleared
  .cache/deja_dup, and then it accepted that folder.  However when I
  then put back the rest of the subfolders it failed again.

  I copied the complete git repository to another machine (running up to
  date Ubuntu 12.04) and backing up from there (to a different U1
  account) deja_dup has no problems.

  I also notice that on Raring it  always takes a long time in the
  verification phase even when only a trivial change has been made.  It
  is as if it is downloading the whole repository, but whether that is a
  related problem I do not know.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: deja-dup 25.5-0ubuntu1
  ProcVersionSignature: Ubuntu 3.8.0-15.25-generic 3.8.4
  Uname: Linux 3.8.0-15-generic i686
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: i386
  Date: Thu Mar 28 20:28:06 2013
  InstallationDate: Installed on 2012-08-01 (239 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120730.1)
  MarkForUpload: True
  SourcePackage: deja-dup
  UpgradeStatus: No upgrade log present (probably fresh install)

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