The previous error is in command line.
In command line the 0.8.21 work, but not with deja-dup it is the error :
Traceback (innermost last):
  File "/usr/bin/duplicity", line 92, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 75, in with_tempdir
    fn()
  File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 1555, in 
main
    action = commandline.ProcessCommandLine(sys.argv[1:])
  File "/usr/lib/python3/dist-packages/duplicity/commandline.py", line 1223, in 
ProcessCommandLine
    config.backend = backend.get_backend(args[0])
  File "/usr/lib/python3/dist-packages/duplicity/backend.py", line 223, in 
get_backend
    obj = get_backend_object(url_string)
  File "/usr/lib/python3/dist-packages/duplicity/backend.py", line 209, in 
get_backend_object
    return factory(pu)
  File "/usr/lib/python3/dist-packages/duplicity/backends/giobackend.py", line 
82, in __init__
    ensure_dbus()
  File "/usr/lib/python3/dist-packages/duplicity/backends/giobackend.py", line 
37, in ensure_dbus
    output = p.communicate()[0].decode("utf8", errors="replace")
 AttributeError: 'str' object has no attribute 'decode'

I have found solution for the 0.8.21 version :


Don't use sudo but su and after launch deja-dup !

So I keep this version :)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to duplicity in Ubuntu.
https://bugs.launchpad.net/bugs/1855736

Title:
  Duplicity fails to start

Status in Duplicity:
  Fix Released
Status in duplicity package in Ubuntu:
  Fix Committed

Bug description:
  I am on 19.10.  Duplicity crashes as soon as I try to start a backup,
  as below. It was running fine on 19.04.

  Traceback (innermost last):
    File "/usr/bin/duplicity", line 107, in <module>
      with_tempdir(main)
    File "/usr/bin/duplicity", line 93, in with_tempdir
      fn()
    File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 1522, in 
main
      action = commandline.ProcessCommandLine(sys.argv[1:])
    File "/usr/lib/python3/dist-packages/duplicity/commandline.py", line 1200, 
in ProcessCommandLine
      globals.backend = backend.get_backend(args[0])
    File "/usr/lib/python3/dist-packages/duplicity/backend.py", line 225, in 
get_backend
      obj = get_backend_object(url_string)
    File "/usr/lib/python3/dist-packages/duplicity/backend.py", line 211, in 
get_backend_object
      return factory(pu)
    File "/usr/lib/python3/dist-packages/duplicity/backends/giobackend.py", 
line 81, in __init__
      ensure_dbus()
    File "/usr/lib/python3/dist-packages/duplicity/backends/giobackend.py", 
line 37, in ensure_dbus
      lines = output.split(u'\n')
   TypeError: a bytes-like object is required, not 'str'

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