Comment 3 for bug 1736164

Same problem here, also on Fedora 26, when trying to perform a backup:

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1540, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1534, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1385, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1509, in do_backup
    full_backup(col_stats)
  File "/usr/bin/duplicity", line 572, in full_backup
    globals.backend)
  File "/usr/bin/duplicity", line 453, in write_multivol
    (tdp, dest_filename, vol_num)))
  File "/usr/lib64/python2.7/site-packages/duplicity/asyncscheduler.py", line 146, in schedule_task
    return self.__run_synchronously(fn, params)
  File "/usr/lib64/python2.7/site-packages/duplicity/asyncscheduler.py", line 172, in __run_synchronously
    ret = fn(*params)
  File "/usr/bin/duplicity", line 452, in <lambda>
    vol_num: put(tdp, dest_filename, vol_num),
  File "/usr/bin/duplicity", line 341, in put
    backend.put(tdp, dest_filename)
  File "/usr/lib64/python2.7/site-packages/duplicity/backend.py", line 376, in inner_retry
    % exception_traceback())
  File "/usr/lib64/python2.7/site-packages/duplicity/util.py", line 51, in exception_traceback
    return uexc(msg)
  File "/usr/lib64/python2.7/site-packages/duplicity/util.py", line 79, in uexc
    e = unicode(e).encode('utf-8')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 748: ordinal not in range(128)