Getting similar issue after upgrading to Ubuntu 20.10:

Traceback (innermost last):
  File "/usr/bin/duplicity", line 106, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 92, in with_tempdir
    fn()
  File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 1538, in 
main
    do_backup(action)
  File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 1674, in 
do_backup
    incremental_backup(sig_chain)
  File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 655, in 
incremental_backup
    bytes_written = dummy_backup(tarblock_iter)
  File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 224, in 
dummy_backup
    while next(tarblock_iter):
  File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 544, in 
__next__
    result = self.process(next(self.input_iter))  # pylint: 
disable=assignment-from-no-return
  File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 209, in 
get_delta_iter
    for new_path, sig_path in collated:
  File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 296, in 
collate2iters
    relem1 = next(riter1)
  File "/usr/lib/python3/dist-packages/duplicity/selection.py", line 97, in 
__next__
    return next(self.iter)
  File "/usr/lib/python3/dist-packages/duplicity/selection.py", line 181, in 
Iterate
    subpath, val = next(diryield_stack[-1])
  File "/usr/lib/python3/dist-packages/duplicity/selection.py", line 148, in 
diryield
    s = self.Select(new_path)
  File "/usr/lib/python3/dist-packages/duplicity/selection.py", line 210, in 
Select
    result = sf(path)
  File "/usr/lib/python3/dist-packages/duplicity/selection.py", line 458, in 
exclude_sel_func
    elif path.append(filename).exists():
  File "/usr/lib/python3/dist-packages/duplicity/path.py", line 566, in append
    return self.__class__(self.base, self.index + (ext,))
  File "/usr/lib/python3/dist-packages/duplicity/path.py", line 539, in __init__
    self.setdata()
  File "/usr/lib/python3/dist-packages/duplicity/path.py", line 549, in setdata
    self.stat = os.lstat(self.name)
 PermissionError: [Errno 13] Permission denied: 
b'/home/nikodll/.hardinfo/.deja-dup-ignore'


---------

$ python3 /usr/bin/duplicity --version
> duplicity 0.8.12

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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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