Public bug reported:

The following script is used to run duplicity for backup

# Version  PA01/01  by T Pollák  on 2018-11-02
# This script is used to create a full backup of this computer
# and must be run as root.
# The script will run the backup command duplicity to create
# a full backup on My Book Live as IP 192.168.1.100 with ftp
# into the directory 64HP in the share Tommy.
# The script is developed from the script backup_duplicity_full64.
# To create incremental backups run the script
# /home/tpollak/bin/backup_duplicity_incrHP as root.
# - - - - - -

PASSPHRASE=*******
FTP_PASSWORD=****
export PASSPHRASE FTP_PASSWORD

duplicity full --force --volsize 1000 --exclude /media/OS/Program\
Files/WindowsApps --exclude /media/OS/Windows --exclude /boot --exclude
/cdrom --exclude /dev --exclude /proc --exclude /sys --exclude /tmp
--exclude /home/tpollak/.gvfs --exclude /run/user/1000/gvfs --exclude
/home/tpollak/Downloads --exclude /home/tpollak/Trash /
ftp://Tommy@192.168.1.100/Tommy/64HP

This looks like the following in the terminal

~$ sudo bin/backup_duplicity_fullHP 
LFTP version is 4.8.4
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Tue Oct  1 11:56:24 2019
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 1535, in 
main
    do_backup(action)
  File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 1659, in 
do_backup
    full_backup(col_stats)
  File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 565, in 
full_backup
    globals.backend)
  File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 422, in 
write_multivol
    globals.volsize)
  File "/usr/lib/python3/dist-packages/duplicity/gpg.py", line 393, in 
GPGWriteFile
    data = block_iter.__next__().data
  File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 542, 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 680, in 
process
    data, last_block = self.get_data_block(fp)
  File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 707, in 
get_data_block
    buf = fp.read(read_size)
  File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 449, in read
    buf = self.infile.read(length)
  File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 417, in read
    log.Warn(_(u"Error %s getting delta for %s") % (str(ex), 
self.infile.uc_name))
 AttributeError: '_io.BufferedReader' object has no attribute 'uc_name'

~$

Below is an excerpt from a listing of the backup directory

......
ftp> open 192.168.1.100
ftp> cd Tommy/64HP
ftp> ls
......
-rwxr-xr-x    1 ftp      ftp      1048607916 Dec 01 23:38 
duplicity-full.20191201T135308Z.vol102.difftar.gpg
-rwxr-xr-x    1 ftp      ftp      1048616177 Dec 01 23:43 
duplicity-full.20191201T135308Z.vol103.difftar.gpg
-rwxr-xr-x    1 ftp      ftp      1048608039 Dec 01 23:47 
duplicity-full.20191201T135308Z.vol104.difftar.gpg
-rwxr-xr-x    1 ftp      ftp      504667096 Dec 01 23:49 
duplicity-full.20191201T135308Z.vol105.difftar.gpg
-rwxr-xr-x    1 ftp      ftp      1048619424 Dec 01 15:49 
duplicity-full.20191201T135308Z.vol11.difftar.gpg

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: duplicity 0.8.04-2ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Dec  2 15:16:02 2019
InstallationDate: Installed on 2018-10-12 (415 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: duplicity
UpgradeStatus: Upgraded to eoan on 2019-10-29 (33 days ago)

** Affects: duplicity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan

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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/1854758

Title:
  duplicity crashes since upgraded to 19.10

Status in duplicity package in Ubuntu:
  New

Bug description:
  The following script is used to run duplicity for backup

  # Version  PA01/01  by T Pollák  on 2018-11-02
  # This script is used to create a full backup of this computer
  # and must be run as root.
  # The script will run the backup command duplicity to create
  # a full backup on My Book Live as IP 192.168.1.100 with ftp
  # into the directory 64HP in the share Tommy.
  # The script is developed from the script backup_duplicity_full64.
  # To create incremental backups run the script
  # /home/tpollak/bin/backup_duplicity_incrHP as root.
  # - - - - - -

  PASSPHRASE=*******
  FTP_PASSWORD=****
  export PASSPHRASE FTP_PASSWORD

  duplicity full --force --volsize 1000 --exclude /media/OS/Program\
  Files/WindowsApps --exclude /media/OS/Windows --exclude /boot
  --exclude /cdrom --exclude /dev --exclude /proc --exclude /sys
  --exclude /tmp --exclude /home/tpollak/.gvfs --exclude
  /run/user/1000/gvfs --exclude /home/tpollak/Downloads --exclude
  /home/tpollak/Trash / ftp://Tommy@192.168.1.100/Tommy/64HP

  This looks like the following in the terminal

  ~$ sudo bin/backup_duplicity_fullHP 
  LFTP version is 4.8.4
  Local and Remote metadata are synchronized, no sync needed.
  Last full backup date: Tue Oct  1 11:56:24 2019
  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 1535, in 
main
      do_backup(action)
    File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 1659, in 
do_backup
      full_backup(col_stats)
    File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 565, in 
full_backup
      globals.backend)
    File "/usr/lib/python3/dist-packages/duplicity/dup_main.py", line 422, in 
write_multivol
      globals.volsize)
    File "/usr/lib/python3/dist-packages/duplicity/gpg.py", line 393, in 
GPGWriteFile
      data = block_iter.__next__().data
    File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 542, 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 680, in 
process
      data, last_block = self.get_data_block(fp)
    File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 707, in 
get_data_block
      buf = fp.read(read_size)
    File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 449, in 
read
      buf = self.infile.read(length)
    File "/usr/lib/python3/dist-packages/duplicity/diffdir.py", line 417, in 
read
      log.Warn(_(u"Error %s getting delta for %s") % (str(ex), 
self.infile.uc_name))
   AttributeError: '_io.BufferedReader' object has no attribute 'uc_name'

  ~$

  Below is an excerpt from a listing of the backup directory

  ......
  ftp> open 192.168.1.100
  ftp> cd Tommy/64HP
  ftp> ls
  ......
  -rwxr-xr-x    1 ftp      ftp      1048607916 Dec 01 23:38 
duplicity-full.20191201T135308Z.vol102.difftar.gpg
  -rwxr-xr-x    1 ftp      ftp      1048616177 Dec 01 23:43 
duplicity-full.20191201T135308Z.vol103.difftar.gpg
  -rwxr-xr-x    1 ftp      ftp      1048608039 Dec 01 23:47 
duplicity-full.20191201T135308Z.vol104.difftar.gpg
  -rwxr-xr-x    1 ftp      ftp      504667096 Dec 01 23:49 
duplicity-full.20191201T135308Z.vol105.difftar.gpg
  -rwxr-xr-x    1 ftp      ftp      1048619424 Dec 01 15:49 
duplicity-full.20191201T135308Z.vol11.difftar.gpg

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: duplicity 0.8.04-2ubuntu1
  ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
  Uname: Linux 5.3.0-23-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Dec  2 15:16:02 2019
  InstallationDate: Installed on 2018-10-12 (415 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  SourcePackage: duplicity
  UpgradeStatus: Upgraded to eoan on 2019-10-29 (33 days ago)

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