Public bug reported:

$ uname -a
Linux mbpr13b 4.13.0-16-generic #19-Ubuntu SMP Wed Oct 11 18:35:14 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux

duplicity gets started daily via deja-dup automatically.

Every now and then (approx. every third time) I get the following error:

------------------

Failed with an unknown error.

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1546, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1540, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1391, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1468, in do_backup
    restore(col_stats)
  File "/usr/bin/duplicity", line 731, in restore
    restore_get_patched_rop_iter(col_stats)):
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 560, in 
Write_ROPaths
    for ropath in rop_iter:
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 523, in 
integrate_patch_iters
    for patch_seq in collated:
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 389, in 
yield_tuples
    setrorps(overflow, elems)
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 378, in 
setrorps
    elems[i] = iter_list[i].next()
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 107, in 
filter_path_iter
    for path in path_iter:
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 121, in 
difftar2path_iter
    tarinfo_list = [tar_iter.next()]
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 339, in 
next
    self.set_tarfile()
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 333, in 
set_tarfile
    self.current_fp = self.fileobj_iter.next()
  File "/usr/bin/duplicity", line 768, in get_fileobj_iter
    manifest.volume_info_dict[vol_num])
  File "/usr/bin/duplicity", line 811, in restore_get_enc_fileobj
    fileobj = tdp.filtered_open_with_delete("rb")
  File "/usr/lib/python2.7/dist-packages/duplicity/dup_temp.py", line 119, in 
filtered_open_with_delete
    fh = FileobjHooked(path.DupPath.filtered_open(self, mode))
  File "/usr/lib/python2.7/dist-packages/duplicity/path.py", line 778, in 
filtered_open
    return gpg.GPGFile(False, self, gpg_profile)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 202, in 
__init__
    'logger': self.logger_fp})
  File "/usr/lib/python2.7/dist-packages/duplicity/gpginterface.py", line 374, 
in run
    create_fhs, attach_fhs)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpginterface.py", line 420, 
in _attach_fork_exec
    process.thread.start()
  File "/usr/lib/python2.7/threading.py", line 736, in start
    _start_new_thread(self.__bootstrap, ())
error: can't start new thread

--------------

Restarting deja-dup manually fixes the problem and the next few days,
automatic backup will run correctly until (see above).

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: duplicity 0.7.12-1ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 26 10:49:45 2017
InstallationDate: Installed on 2017-10-20 (5 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: duplicity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: duplicity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful wayland-session

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https://bugs.launchpad.net/bugs/1727653

Title:
  duplicity fails with unknown error

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