[Ubuntu trusty]Errors while using gedit

[Guybrush88]

I got these errors while modifying /etc/apt/sources.list:

~$ sudo gedit /etc/apt/sources.list

(gedit:3329): Gtk-WARNING **: Calling Inhibit failed: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

(gedit:3329): Gtk-WARNING **: Calling Inhibit failed: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

everything worked, though
---
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
InstallationDate: Installed on 2014-10-05 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
Package: gedit 3.10.4-0ubuntu4
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Tags: trusty
Uname: Linux 3.13.0-37-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

[Guybrush88 (guybrush)]

apport information

[Guybrush88 (guybrush)]

apport information

[MikeR (mike-rechtman)]

Happens when I use gksudo (not sudo)
Tahr with Gnome-flashback, fully updated

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.