Oh and I should have mentioned workarounds:
- give everyone execute permission on the offending folder
- install the snap version of duplicity
- install the snap (or flatpak) version of deja-dup

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https://bugs.launchpad.net/bugs/1905170

Title:
  Impossible to create a full backup due to permission error on
  /home/lost+found folder

Status in deja-dup package in Ubuntu:
  New

Bug description:
  Error only happen since upgrade to 20.10. Everything worked on ubuntu
  20.04. Same error if I try to change location of the backup. Folder
  /home/lost+found/ is not in the configuration of deja-dup.

  Error message displayed:
    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 1662, in 
do_backup
      full_backup(col_stats)
    File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 559, in 
full_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 310, in 
collate2iters
      for relem1 in 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/lost+found/.deja-dup-ignore'

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