The link you provided (http://askubuntu.com/q/787244/25388) shows you solved the dependency problem (it's indeed a matter of installing deja- dup AND deja-dup-backend-gvfs), so I'm closing this bug. See also bugs 1606449 and 1641423 for more about this dependency issue.
The other problem you mention in that AskUbuntu question is related to permissions on a NTFS volume mounted as root, if I understand correctly. This is unrelated to the dependency issue and this bug report. Also, Déjà Dup is supposed to be used by a normal user to back up their own user data to a location that is writable by that user. There are better tools for root to back up a complete disk or several users' data. This is not the focus of Déjà Dup. ** Changed in: deja-dup (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to deja-dup in Ubuntu. https://bugs.launchpad.net/bugs/1592735 Title: deja-dup 34.2 fails on dependencies Status in deja-dup package in Ubuntu: Invalid Bug description: Similar as #1576394 but the bug did not resolve with `sudo apt-get install duplicity python-gi`. System: Ubuntu 16.04 Linux kernel: 4.6 Deda-dup: 34.2 Thread: http://askubuntu.com/q/787244/25388 ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: deja-dup 34.2-0ubuntu1 Uname: Linux 4.6.0-040600-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity Date: Wed Jun 15 12:52:37 2016 InstallationDate: Installed on 2016-06-05 (9 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) SourcePackage: deja-dup UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/deja-dup/+bug/1592735/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp