As per https://bugzilla.gnome.org/show_bug.cgi?id=747718#c13 this is a samba library bug.
** Package changed: nautilus (Ubuntu) => samba (Ubuntu) ** Changed in: nautilus Importance: Medium => Undecided ** Changed in: nautilus Status: Unknown => New ** Changed in: nautilus Remote watch: GNOME Bug Tracker #747718 => None -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/1442972 Title: Unable to access location Failed to mount Windows share: Invalid argument Status in Nautilus: New Status in samba package in Ubuntu: Triaged Bug description: When attempting to mount a Ubuntu samba share via Nautilus, it notes: Unable to access location Failed to mount Windows share: Invalid argument However, mounting via smbclient works fine. Hence, this would be an issue with Nautilus/backend. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: nautilus 1:3.14.2-0ubuntu8 ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3 Uname: Linux 3.19.0-12-generic x86_64 ApportVersion: 2.17-0ubuntu2 Architecture: amd64 CurrentDesktop: GNOME-Flashback:Unity Date: Sat Apr 11 16:42:15 2015 GsettingsChanges: b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']" InstallationDate: Installed on 2014-06-21 (293 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) SourcePackage: nautilus UpgradeStatus: Upgraded to vivid on 2015-03-13 (29 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/nautilus/+bug/1442972/+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