Duplicity fails during backup in with_tempdir()

[Sameer Morar]

Description: Ubuntu Utopic Unicorn (development branch)
Release: 14.10

duplicity:
  Installed: 0.6.23-1ubuntu5
  Candidate: 0.6.23-1ubuntu5
  Version table:
 *** 0.6.23-1ubuntu5 0
        500 http://au.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages
        100 /var/lib/dpkg/status

During a full system backup, using the deja-dup, the process gets about half-way through and then stops with the following error:
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 324, in GPGWriteFile
    file = GPGFile(True, path.Path(filename), profile)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 105, in __init__
    self.logger_fp = tempfile.TemporaryFile( dir=tempdir.default().dir() )
  File "/usr/lib/python2.7/tempfile.py", line 497, in TemporaryFile
    (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
  File "/usr/lib/python2.7/tempfile.py", line 239, in _mkstemp_inner
    fd = _os.open(file, flags, 0600)
OSError: [Errno 2] No such file or directory: '/tmp/duplicity-DEgmK7-tempdir/tmplcuF1s'

The referred to directory does not exist, however, the following one does exist:
/tmp/duplicity-l4bYos-tempdir/

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.