I am seeing this too. It happened first time after I started backups
from scratch after several weeks. It keeps occurring every day now.

Traceback (innermost last):
  File "/usr/bin/duplicity", line 1555, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1541, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1393, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1472, in do_backup
    restore(col_stats)
  File "/usr/bin/duplicity", line 728, in restore
    restore_get_patched_rop_iter(col_stats)):
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 558, in 
Write_ROPaths
    for ropath in rop_iter:
  File "/usr/lib/python2.7/dist-packages/duplicity/patchdir.py", line 521, 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 764, in get_fileobj_iter
    backup_set.volume_name_dict[vol_num],
 KeyError: 43

This is with duplicity 0.7.17+bzr1353 and deja-dup 36.3 on Ubuntu 17.10.

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https://bugs.launchpad.net/bugs/498933

Title:
  Crash when restoring data KeyError

Status in Déjà Dup:
  Invalid
Status in Duplicity:
  Confirmed
Status in deja-dup package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: deja-dup

  1) Ubuntu 9.10
  2) Deja Dup 10.2-0ubuntu1.1
  3) I expected my backup to be restored
  4) Deja Dup crashed instead.

  I just tried to restore the backup I made, and it crashes repeatedly
  when trying to restore.

  I have it setup to backup my home directory, and tried restoring to
  both the original location as well as a completely different folder.
  Both lead to the same error message.

  
  Traceback (most recent call last):
    File "/usr/bin/duplicity", line 825, in <module>
      with_tempdir(main)
    File "/usr/bin/duplicity", line 818, in with_tempdir
      fn()
    File "/usr/bin/duplicity", line 775, in main
      restore(col_stats)
    File "/usr/bin/duplicity", line 436, in restore
      restore_get_patched_rop_iter(col_stats)):
    File "/usr/lib/python2.6/dist-packages/duplicity/patchdir.py", line 521, in 
Write_ROPaths
      ITR(ropath.index, ropath)
    File "/usr/lib/python2.6/dist-packages/duplicity/lazy.py", line 336, in 
__call__
      last_branch.fast_process, args)
    File "/usr/lib/python2.6/dist-packages/duplicity/robust.py", line 38, in 
check_common_error
      return function(*args)
    File "/usr/lib/python2.6/dist-packages/duplicity/patchdir.py", line 574, in 
fast_process
      ropath.copy(self.base_path.new_index(index))
    File "/usr/lib/python2.6/dist-packages/duplicity/path.py", line 412, in copy
      other.writefileobj(self.open("rb"))
    File "/usr/lib/python2.6/dist-packages/duplicity/path.py", line 574, in 
writefileobj
      buf = fin.read(_copy_blocksize)
    File "/usr/lib/python2.6/dist-packages/duplicity/patchdir.py", line 199, in 
read
      if not self.addtobuffer():
    File "/usr/lib/python2.6/dist-packages/duplicity/patchdir.py", line 224, in 
addtobuffer
      self.tarinfo_list[0] = self.tar_iter.next()
    File "/usr/lib/python2.6/dist-packages/duplicity/patchdir.py", line 331, in 
next
      self.set_tarfile()
    File "/usr/lib/python2.6/dist-packages/duplicity/patchdir.py", line 320, in 
set_tarfile
      self.current_fp = self.fileobj_iter.next()
    File "/usr/bin/duplicity", line 472, in get_fileobj_iter
      backup_set.volume_name_dict[vol_num],
  KeyError: 15

  ProblemType: Bug
  Architecture: i386
  Date: Sun Dec 20 19:59:06 2009
  DistroRelease: Ubuntu 9.10
  ExecutablePath: /usr/bin/deja-dup
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
  Package: deja-dup 10.2-0ubuntu1.1
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-16.53-generic
  SourcePackage: deja-dup
  Uname: Linux 2.6.31-16-generic i686

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