I tried to monitor via jouralctl -f

first attempts suggest that the application can't create a directory
/var/cache/samba

I added write access to /var/cache for world.

Then I got this

Sep 23 14:05:35 mbpr13b dbus-daemon[2751]: Activating service 
name='org.gnome.DejaDup'
Sep 23 14:05:35 mbpr13b dbus-daemon[2751]: Successfully activated service 
'org.gnome.DejaDup'
Sep 23 14:05:37 mbpr13b PackageKit[1129]: resolve transaction /511_eccbbeed 
from uid 1000 finished with success after 394ms
Sep 23 14:05:37 mbpr13b deja-dup[4000]: BackendRemote.vala:83: Could not find 
enclosing mount
Sep 23 14:05:37 mbpr13b deja-dup[4000]: BackendRemote.vala:83: Could not find 
enclosing mount

Mounting the directory manually

Sep 23 14:08:18 mbpr13b dbus-daemon[2751]: Activating service 
name='org.gnome.Nautilus'
Sep 23 14:08:18 mbpr13b dbus-daemon[2751]: Successfully activated service 
'org.gnome.Nautilus'
Sep 23 14:08:18 mbpr13b org.gnome.Nautilus[2751]: sys:1: PyGIWarning: Nautilus 
was imported without specifying a version first. Use 
gi.require_version('Nautilus', '3.0') before import to ensure that the right 
version gets loaded.
Sep 23 14:08:18 mbpr13b dbus[891]: [system] Activating via systemd: service 
name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service'
Sep 23 14:08:18 mbpr13b systemd[1]: Starting Hostname Service...
Sep 23 14:08:18 mbpr13b nautilus[4157]: Called "net usershare info" but it 
failed: Failed to execute child process “net” (No such file or directory)
Sep 23 14:08:18 mbpr13b dbus[891]: [system] Successfully activated service 
'org.freedesktop.hostname1'
Sep 23 14:08:18 mbpr13b systemd[1]: Started Hostname Service.
Sep 23 14:08:20 mbpr13b gvfsd[2791]: mkdir failed on directory 
/var/cache/samba: Permission denied
Sep 23 14:08:20 mbpr13b gvfsd[2791]: mkdir failed on directory 
/var/cache/samba: Permission denied
Sep 23 14:08:20 mbpr13b gvfsd[2791]: mkdir failed on directory 
/var/cache/samba: Permission denied
Sep 23 14:08:20 mbpr13b gvfsd[2791]: mkdir failed on directory 
/var/cache/samba: Permission denied

The mount works though.

Sep 23 14:10:56 mbpr13b dbus-daemon[2751]: Activating service 
name='org.gnome.DejaDup'
Sep 23 14:10:56 mbpr13b dbus-daemon[2751]: Successfully activated service 
'org.gnome.DejaDup'
Sep 23 14:11:00 mbpr13b PackageKit[1129]: resolve transaction /512_dedcceee 
from uid 1000 finished with success after 422ms
Sep 23 14:11:00 mbpr13b deja-dup[4216]: BackendRemote.vala:83: Could not find 
enclosing mount
Sep 23 14:11:00 mbpr13b deja-dup[4216]: BackendRemote.vala:83: Could not find 
enclosing mount

Same issue.

Sep 23 14:15:08 mbpr13b org.gnome.Nautilus[2751]: **
Sep 23 14:15:08 mbpr13b org.gnome.Nautilus[2751]: 
ERROR:../src/nautilus-bookmark.c:387:nautilus_bookmark_connect_file: assertion 
failed: (!nautilus_file_is_gone (bookmark->file))
Sep 23 14:15:11 mbpr13b dbus-daemon[2751]: Activating service 
name='org.gnome.Nautilus'
Sep 23 14:15:11 mbpr13b dbus-daemon[2751]: Successfully activated service 
'org.gnome.Nautilus'
Sep 23 14:15:11 mbpr13b gsd-media-keys[2953]: Couldn't lock screen: Timeout was 
reached
Sep 23 14:15:11 mbpr13b org.gnome.Nautilus[2751]: sys:1: PyGIWarning: Nautilus 
was imported without specifying a version first. Use 
gi.require_version('Nautilus', '3.0') before import to ensure that the right 
version gets loaded.
Sep 23 14:15:11 mbpr13b dbus[891]: [system] Activating via systemd: service 
name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service'
Sep 23 14:15:11 mbpr13b systemd[1]: Starting Hostname Service...
Sep 23 14:15:11 mbpr13b nautilus[4292]: Called "net usershare info" but it 
failed: Failed to execute child process “net” (No such file or directory)
Sep 23 14:15:11 mbpr13b dbus[891]: [system] Successfully activated service 
'org.freedesktop.hostname1'
Sep 23 14:15:11 mbpr13b systemd[1]: Started Hostname Service.
Sep 23 14:15:14 mbpr13b gvfsd[2791]: mkdir failed on directory /var/run/samba: 
Permission denied
Sep 23 14:15:14 mbpr13b gvfsd[2791]: mkdir failed on directory /var/run/samba: 
Permission denied
Sep 23 14:15:14 mbpr13b gvfsd[2791]: mkdir failed on directory /var/run/samba: 
Permission denied
Sep 23 14:15:14 mbpr13b gvfsd[2791]: mkdir failed on directory /var/run/samba: 
Permission denied
Sep 23 14:15:14 mbpr13b gvfsd[2791]: mkdir failed on directory /var/run/samba: 
Permission denied
Sep 23 14:15:14 mbpr13b gvfsd[2791]: mkdir failed on directory /var/run/samba: 
Permission denied

Tried sudo chown o+w /run

Mounting the share does not bring up any error messages any more.

Deja-dup still fails
and there are no files created in cache or run

Still: the old deja-dup from Ubuntu 17.04 works fine.

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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/1715582

Title:
  "Operation not supported by backend" when backing up to smb server

Status in deja-dup package in Ubuntu:
  New

Bug description:
  OS: Ubuntu 17.10 beta
  setting up deja-dup to backup to smb/ssh server fails

  With ssh: Permission denied
  syslog:
  Sep  7 10:30:05 mbpr13b deja-dup[30252]: Allocating size to AssistantBackup 
0x55d581f75f50 without calling gtk_widget_get_preferred_width/height(). How 
does the code know the size to allocate?
  Sep  7 10:30:05 mbpr13b PackageKit: resolve transaction /149_caabebdc from 
uid 1000 finished with success after 414ms

  
  with smb: Backup failed
  InvalidBackendURL: missing // - relative paths not supported for scheme 
gio+invalid: gio+invalid://
  syslog:
  Sep  7 10:32:45 mbpr13b deja-dup[30252]: Allocating size to AssistantBackup 
0x55d581fecb70 without calling gtk_widget_get_preferred_width/height(). How 
does the code know the size to allocate?
  Sep  7 10:32:45 mbpr13b PackageKit: resolve transaction /150_abaacaad from 
uid 1000 finished with success after 402ms

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: deja-dup 35.6-0ubuntu1
  ProcVersionSignature: Ubuntu 4.12.0-13.14-generic 4.12.10
  Uname: Linux 4.12.0-13-generic x86_64
  ApportVersion: 2.20.7-0ubuntu1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Sep  7 10:30:37 2017
  InstallationDate: Installed on 2017-09-05 (1 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170902)
  SourcePackage: deja-dup
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/ubuntu/+source/deja-dup/+bug/1715582/+subscriptions

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