I also noticed that the log files do not contain the actual error that I
get on the command line. Both the above mentioned commands give the same
error. So, here is the error:

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1239, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1232, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1137, in main
    globals.archive_dir).set_values()
  File "/usr/lib/python2.6/dist-packages/duplicity/collections.py", line 692, 
in set_values
    backup_chains)
  File "/usr/lib/python2.6/dist-packages/duplicity/collections.py", line 705, 
in set_matched_chain_pair
    sig_chains = sig_chains and self.get_sorted_chains(sig_chains)
  File "/usr/lib/python2.6/dist-packages/duplicity/collections.py", line 918, 
in get_sorted_chains
    assert len(chain_list) == 2
AssertionError

** Description changed:

  Description:  Ubuntu 10.04.3 LTS
  Release:      10.04
  deja-dup:
-   Installed: 14.2-0ubuntu0.1
-   Candidate: 14.2-0ubuntu0.1
+   Installed: 14.2-0ubuntu0.1
+   Candidate: 14.2-0ubuntu0.1
+   Version table:
+  *** 14.2-0ubuntu0.1 0
+         500 http://in.archive.ubuntu.com/ubuntu/ lucid-updates/universe 
Packages
+         100 /var/lib/dpkg/status
+      14.0.3-0ubuntu1 0
+         500 http://in.archive.ubuntu.com/ubuntu/ lucid/universe Packages
+ Expected Outcome: deja-dup should have continued with the remaining part of 
the earlier backup. (I had clicked on "Resume Later" when an earlier backup was 
going on.)
+ duplicity:
+   Installed: 0.6.08b-0ubuntu2
+   Candidate: 0.6.08b-0ubuntu2
    Version table:
-  *** 14.2-0ubuntu0.1 0
-         500 http://in.archive.ubuntu.com/ubuntu/ lucid-updates/universe 
Packages
+  *** 0.6.08b-0ubuntu2 0
+         500 http://in.archive.ubuntu.com/ubuntu/ lucid/universe Packages
          100 /var/lib/dpkg/status
-      14.0.3-0ubuntu1 0
-         500 http://in.archive.ubuntu.com/ubuntu/ lucid/universe Packages
- Expected Outcome: deja-dup should have continued with the remaining part of 
the earlier backup. (I had clicked on "Resume Later" when an earlier backup was 
going on.)
  Actual Outcome: When I run deja-dup Backup or Restore, I get the message: 
"deja-dup exited with unknown error". So, I ran it from the terminal and this 
is the output that I got:
  
  rigved@rigved-desktop:~$ deja-dup
  ** (deja-dup:3096): DEBUG: DuplicityInstance.vala:199: Running the following 
duplicity (3134) command: duplicity collection-status --gio 
file:///media/My%20Passport/UbuntuBackup --verbosity=9 --gpg-options=  
--archive-dir=/home/rigved/.cache/deja-dup --log-file=/tmp/deja-dup-LR4W1V
  
  ** (deja-dup:3096): DEBUG: DuplicityInstance.vala:552: duplicity (3134)
  exited with value 1
  
- 
- ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix: assertion `b 
!= NULL' failed
+ ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
+ assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix: assertion `b 
!= NULL' failed
  ** (deja-dup:3096): DEBUG: DuplicityInstance.vala:199: Running the following 
duplicity (3263) command: duplicity collection-status --exclude=/media/My 
Passport/UbuntuBackup --exclude=/home/rigved/Rigved on WINDOWS 
--exclude=/home/rigved/Documents on WINDOWS 
--exclude=/home/rigved/.local/share/Trash --exclude=/home/rigved/.Private 
--exclude=/home/rigved/.recent-applications.xbel 
--exclude=/home/rigved/.recently-used.xbel 
--exclude=/home/rigved/.xsession-errors --exclude=/home/rigved/.gvfs 
--exclude=/home/rigved/.thumbnails --exclude=/home/rigved/.cache 
--include=/home/rigved --include=/var/cache/apt --exclude=/sys --exclude=/proc 
--exclude=/tmp --exclude=** --gio file:///media/My%20Passport/UbuntuBackup 
--verbosity=9 --gpg-options=  --archive-dir=/home/rigved/.cache/deja-dup 
--log-file=/tmp/deja-dup-4IJ81V
  
  ** (deja-dup:3096): DEBUG: DuplicityInstance.vala:552: duplicity (3263)
  exited with value 1
  
  exception in setExpando
  5610971606 > 2507025240
  CHECK IS 2335945320
  
  As you can see, my external hard drive has a space in the name. So, I
  ran the following duplicity command manually. I have attached the log
  files of the runs.
  
  First command:
  
  rigved@rigved-desktop:~$ duplicity collection-status --gio
  file:///media/My%20Passport/UbuntuBackup --verbosity=9 --gpg-options=
  --archive-dir=/home/rigved/.cache/deja-dup --log-file=/tmp/deja-dup-
  LR4W1V
  
  and the second command:
  
  rigved@rigved-desktop:~$ duplicity collection-status
  --exclude="/media/My Passport/UbuntuBackup"
  --exclude="/home/rigved/Rigved on WINDOWS"
  --exclude="/home/rigved/Documents on WINDOWS"
  --exclude=/home/rigved/.local/share/Trash
  --exclude=/home/rigved/.Private --exclude=/home/rigved/.recent-
  applications.xbel --exclude=/home/rigved/.recently-used.xbel
  --exclude=/home/rigved/.xsession-errors --exclude=/home/rigved/.gvfs
  --exclude=/home/rigved/.thumbnails --exclude=/home/rigved/.cache
  --include=/home/rigved --include=/var/cache/apt --exclude=/sys
  --exclude=/proc --exclude=/tmp --exclude=** --gio
  file:///media/My%20Passport/UbuntuBackup --verbosity=9 --gpg-options=
  --archive-dir=/home/rigved/.cache/deja-dup --log-file=/tmp/deja-dup-
  4IJ81V
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: deja-dup 14.2-0ubuntu0.1
  ProcVersionSignature: Ubuntu 2.6.32-33.72-generic 2.6.32.41+drm33.18
  Uname: Linux 2.6.32-33-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  CheckboxSubmission: b02353445d864acc18f07cc4a57ed0b4
  CheckboxSystem: 0531969bcfd4f03af7405c98dc94a948
  Date: Thu Sep 15 11:30:05 2011
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  ProcEnviron:
-  LANG=en_IN
-  SHELL=/bin/bash
+  LANG=en_IN
+  SHELL=/bin/bash
  SourcePackage: deja-dup

** Description changed:

  Description:  Ubuntu 10.04.3 LTS
  Release:      10.04
  deja-dup:
    Installed: 14.2-0ubuntu0.1
    Candidate: 14.2-0ubuntu0.1
    Version table:
   *** 14.2-0ubuntu0.1 0
          500 http://in.archive.ubuntu.com/ubuntu/ lucid-updates/universe 
Packages
          100 /var/lib/dpkg/status
       14.0.3-0ubuntu1 0
          500 http://in.archive.ubuntu.com/ubuntu/ lucid/universe Packages
- Expected Outcome: deja-dup should have continued with the remaining part of 
the earlier backup. (I had clicked on "Resume Later" when an earlier backup was 
going on.)
  duplicity:
    Installed: 0.6.08b-0ubuntu2
    Candidate: 0.6.08b-0ubuntu2
    Version table:
   *** 0.6.08b-0ubuntu2 0
          500 http://in.archive.ubuntu.com/ubuntu/ lucid/universe Packages
          100 /var/lib/dpkg/status
+ Expected Outcome: deja-dup should have continued with the remaining part of 
the earlier backup. (I had clicked on "Resume Later" when an earlier backup was 
going on.)
  Actual Outcome: When I run deja-dup Backup or Restore, I get the message: 
"deja-dup exited with unknown error". So, I ran it from the terminal and this 
is the output that I got:
  
  rigved@rigved-desktop:~$ deja-dup
  ** (deja-dup:3096): DEBUG: DuplicityInstance.vala:199: Running the following 
duplicity (3134) command: duplicity collection-status --gio 
file:///media/My%20Passport/UbuntuBackup --verbosity=9 --gpg-options=  
--archive-dir=/home/rigved/.cache/deja-dup --log-file=/tmp/deja-dup-LR4W1V
  
  ** (deja-dup:3096): DEBUG: DuplicityInstance.vala:552: duplicity (3134)
  exited with value 1
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix:
  assertion `b != NULL' failed
  
  ** (deja-dup:3096): CRITICAL **: deja_dup_duplicity_cmp_prefix: assertion `b 
!= NULL' failed
  ** (deja-dup:3096): DEBUG: DuplicityInstance.vala:199: Running the following 
duplicity (3263) command: duplicity collection-status --exclude=/media/My 
Passport/UbuntuBackup --exclude=/home/rigved/Rigved on WINDOWS 
--exclude=/home/rigved/Documents on WINDOWS 
--exclude=/home/rigved/.local/share/Trash --exclude=/home/rigved/.Private 
--exclude=/home/rigved/.recent-applications.xbel 
--exclude=/home/rigved/.recently-used.xbel 
--exclude=/home/rigved/.xsession-errors --exclude=/home/rigved/.gvfs 
--exclude=/home/rigved/.thumbnails --exclude=/home/rigved/.cache 
--include=/home/rigved --include=/var/cache/apt --exclude=/sys --exclude=/proc 
--exclude=/tmp --exclude=** --gio file:///media/My%20Passport/UbuntuBackup 
--verbosity=9 --gpg-options=  --archive-dir=/home/rigved/.cache/deja-dup 
--log-file=/tmp/deja-dup-4IJ81V
  
  ** (deja-dup:3096): DEBUG: DuplicityInstance.vala:552: duplicity (3263)
  exited with value 1
  
  exception in setExpando
  5610971606 > 2507025240
  CHECK IS 2335945320
  
  As you can see, my external hard drive has a space in the name. So, I
  ran the following duplicity command manually. I have attached the log
  files of the runs.
  
  First command:
  
  rigved@rigved-desktop:~$ duplicity collection-status --gio
  file:///media/My%20Passport/UbuntuBackup --verbosity=9 --gpg-options=
  --archive-dir=/home/rigved/.cache/deja-dup --log-file=/tmp/deja-dup-
  LR4W1V
  
  and the second command:
  
  rigved@rigved-desktop:~$ duplicity collection-status
  --exclude="/media/My Passport/UbuntuBackup"
  --exclude="/home/rigved/Rigved on WINDOWS"
  --exclude="/home/rigved/Documents on WINDOWS"
  --exclude=/home/rigved/.local/share/Trash
  --exclude=/home/rigved/.Private --exclude=/home/rigved/.recent-
  applications.xbel --exclude=/home/rigved/.recently-used.xbel
  --exclude=/home/rigved/.xsession-errors --exclude=/home/rigved/.gvfs
  --exclude=/home/rigved/.thumbnails --exclude=/home/rigved/.cache
  --include=/home/rigved --include=/var/cache/apt --exclude=/sys
  --exclude=/proc --exclude=/tmp --exclude=** --gio
  file:///media/My%20Passport/UbuntuBackup --verbosity=9 --gpg-options=
  --archive-dir=/home/rigved/.cache/deja-dup --log-file=/tmp/deja-dup-
  4IJ81V
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: deja-dup 14.2-0ubuntu0.1
  ProcVersionSignature: Ubuntu 2.6.32-33.72-generic 2.6.32.41+drm33.18
  Uname: Linux 2.6.32-33-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  CheckboxSubmission: b02353445d864acc18f07cc4a57ed0b4
  CheckboxSystem: 0531969bcfd4f03af7405c98dc94a948
  Date: Thu Sep 15 11:30:05 2011
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  ProcEnviron:
   LANG=en_IN
   SHELL=/bin/bash
  SourcePackage: deja-dup

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https://bugs.launchpad.net/bugs/850638

Title:
  DuplicityInstance.vala:552: duplicity exited with value 1

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