Backup and restore does not work on SCP backend

I was able to get restore operation to succeed. I had to make 2 changes. Patch is attached.

(duplicitytempo) samuel@bioman2:~/dev/backup/duplicitytempo/duplicity-0.8.09$ python --version
Python 3.7.5
(duplicitytempo) samuel@bioman2:~/dev/backup/duplicitytempo/duplicity-0.8.09$ pip3 list
Package Version
------------ -------
bcrypt 3.1.7
cffi 1.13.2
cryptography 2.8
duplicity 0.8.9
fasteners 0.15
future 0.18.2
monotonic 1.5
paramiko 2.7.1
pip 19.3.1
pycparser 2.19
PyNaCl 1.3.0
setuptools 44.0.0
six 1.13.0
wheel 0.33.6
(duplicitytempo) samuel@bioman2:~/dev/backup/duplicitytempo/duplicity-0.8.09$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 19.10
Release: 19.10
Codename: eoan

log
ssh: [chan 3] Max packet in: 32768 bytes
ssh: [chan 3] Max packet out: 32768 bytes
ssh: Secsh channel 3 opened.
ssh: [chan 3] Sesch channel 3 request ok
ssh: [chan 3] EOF received (3)
ssh: [chan 3] EOF sent (3)
Trace inverse de l'erreur précédente : Traceback (innermost last):
  File "/home/samuel/dev/backup/duplicitytempo/lib/python3.7/site-packages/duplicity/backend.py", line 374, in inner_retry
    return fn(self, *args)
  File "/home/samuel/dev/backup/duplicitytempo/lib/python3.7/site-packages/duplicity/backend.py", line 557, in get
    self.backend._get(remote_filename, local_path)
  File "/home/samuel/dev/backup/duplicitytempo/lib/python3.7/site-packages/duplicity/backends/ssh_paramiko_backend.py", line 346, in _get
    (remote_filename, msg))
 duplicity.errors.BackendException: scp get b'duplicity-full.20181003T214702Z.vol34.difftar.gpg' failed: incorrect response 'scp: /mnt/backup/backup/duplicity/bduplicity-full.20181003T214702Z.vol34.difftar.gpg: No such file or directory'