back up parte ma poi si blocca

Ciao a tutti, dopo l'aggiornamento a 18.04.1 non riesco più a terminare il back up(che prima funzionava regolarmente) con deja dup il quale comincia il back up ma dopo un po' si blocca e appare il messaggio: Traceback (innermost last):

  File "/usr/bin/duplicity", line 1567, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1553, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1405, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1535, in do_backup
    incremental_backup(sig_chain)
  File "/usr/bin/duplicity", line 671, in incremental_backup
    bytes_written = dummy_backup(tarblock_iter)
  File "/usr/bin/duplicity", line 236, in dummy_backup
    while tarblock_iter.next():
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 523, in next
    result = self.process(self.input_iter.next())
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 195, in get_delta_iter
    for new_path, sig_path in collated:
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 286, in collate2iters
    relem2 = riter2.next()
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 354, in combine_path_iters
    refresh_triple_list(triple_list)
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 341, in refresh_triple_list
    new_triple = get_triple(old_triple[1])
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 327, in get_triple
    path = path_iter_list[iter_index].next()
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 239, in sigtar2path_iter
    for tarinfo in tf:
  File "/usr/lib/python2.7/tarfile.py", line 2510, in next
    tarinfo = self.tarfile.next()
  File "/usr/lib/python2.7/tarfile.py", line 2352, in next
    raise ReadError("unexpected end of data")
 ReadError: unexpected end of data

Qualcuno sa come risolvere?