For the first time, I also encountered the same issue. I'm in Ubuntu
20.04

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https://bugs.launchpad.net/bugs/1776030

Title:
  Backup fails with "an unknown error"

Status in deja-dup package in Ubuntu:
  Confirmed

Bug description:
  Trying to a backup to a network drive.  Yesterday Backup decided to do
  the preiodic full backup.  But it fails, and I get the following error
  information with the "unknown error" message:

  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 1522, in do_backup
      check_last_manifest(col_stats)  # not needed for full backup
    File "/usr/bin/duplicity", line 1227, in check_last_manifest
      last_backup_set.check_manifests()
    File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 201, 
in check_manifests
      remote_manifest = self.get_remote_manifest()
    File "/usr/lib/python2.7/dist-packages/duplicity/collections.py", line 242, 
in get_remote_manifest
      return manifest.Manifest().from_string(manifest_buffer)
    File "/usr/lib/python2.7/dist-packages/duplicity/manifest.py", line 188, in 
from_string
      vi = VolumeInfo().from_string(match.group(1))
    File "/usr/lib/python2.7/dist-packages/duplicity/manifest.py", line 388, in 
from_string
      raise VolumeInfoError("Start or end index not set")
   VolumeInfoError: Start or end index not set



  lsb_release -rd >
  Description:  Ubuntu 18.04 LTS
  Release:      18.04

  
  apt-cache policy deja-dup >
  deja-dup:
    Installed: 37.1-2fakesync1
    Candidate: 37.1-2fakesync1
    Version table:
   *** 37.1-2fakesync1 500
          500 http://la-mirrors.evowise.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: deja-dup 37.1-2fakesync1
  ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
  Uname: Linux 4.15.0-22-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jun  9 21:14:08 2018
  InstallationDate: Installed on 2016-02-26 (834 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: deja-dup
  UpgradeStatus: Upgraded to bionic on 2018-05-03 (37 days ago)

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