Backup stops in the middle with a python traceback

[Shoham Peller]

Backup Failed:
Failed with an unknown error.

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1494, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1488, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1337, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1458, in do_backup
    full_backup(col_stats)
  File "/usr/bin/duplicity", line 542, in full_backup
    globals.backend)
  File "/usr/bin/duplicity", line 403, in write_multivol
    globals.gpg_profile, globals.volsize)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 327, in GPGWriteFile
    bytes_to_go = data_size - get_current_size()
  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 320, in get_current_size
    return os.stat(filename).st_size
OSError: [Errno 2] No such file or directory: '/tmp/duplicity-x6bEln-tempdir/mktemp-3XerZ6-13'

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: deja-dup 30.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
Date: Fri May 8 14:52:01 2015
InstallationDate: Installed on 2014-11-05 (184 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: deja-dup
UpgradeStatus: No upgrade log present (probably fresh install)