This is fixed in 19.10 by using the python3 version of duplicity.
You can get the fix on 18.04 by using the snap version of Deja Dup:
snap install deja-dup --classic
** Project changed: deja-dup => deja-dup (Ubuntu)
** Changed in: deja-dup (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1847900
Title:
Daily Deja Dup failure with "Failed with an unknown error."
Status in deja-dup package in Ubuntu:
Fix Released
Bug description:
Daily backup fails with:
```
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 1511, in do_backup
full_backup(col_stats)
File "/usr/bin/duplicity", line 572, in full_backup
globals.backend)
File "/usr/bin/duplicity", line 454, in write_multivol
(tdp, dest_filename, vol_num)))
File "/usr/lib/python2.7/dist-packages/duplicity/asyncscheduler.py", line
146, in schedule_task
return self.__run_synchronously(fn, params)
File "/usr/lib/python2.7/dist-packages/duplicity/asyncscheduler.py", line
172, in __run_synchronously
ret = fn(*params)
File "/usr/bin/duplicity", line 453, in <lambda>
vol_num: put(tdp, dest_filename, vol_num),
File "/usr/bin/duplicity", line 342, in put
backend.put(tdp, dest_filename)
File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 395, in
inner_retry
% (n, e.__class__.__name__, util.uexc(e)))
File "/usr/lib/python2.7/dist-packages/duplicity/util.py", line 79, in uexc
return ufn(unicode(e).encode('utf-8'))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 37:
ordinal not in range(128)
```
Ubuntu 18.04.3 LTS
deja-dup 37.1-2fakesync1ubuntu0.1
duplicity 0.7.17-0ubuntu1.1
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