I suspect you need to install: sudo apt install gnome-shell-extensions
But can you please also clarify what you were doing when the error occurred? and where? ** Summary changed: - Gnome Shell Extention + GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.gnome.Shell.Extensions' on object at path /org/gnome/Shell ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1719153 Title: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.gnome.Shell.Extensions' on object at path /org/gnome/Shell Status in gnome-shell package in Ubuntu: Incomplete Bug description: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.gnome.Shell.Extensions' on object at path /org/gnome/Shell ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: gnome-shell 3.24.2-0ubuntu0.1 ProcVersionSignature: Ubuntu 4.10.0-35.39-generic 4.10.17 Uname: Linux 4.10.0-35-generic x86_64 ApportVersion: 2.20.4-0ubuntu4.5 Architecture: amd64 CurrentDesktop: Unity:Unity7 Date: Sun Sep 24 11:25:55 2017 DisplayManager: lightdm GsettingsChanges: b'org.gnome.desktop.interface' b'cursor-theme' b"'DMZ-White'" b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'" b'org.gnome.desktop.interface' b'icon-theme' b"'ubuntu-mono-dark'" b'org.gnome.desktop.interface' b'scaling-factor' b'uint32 1' b'org.gnome.desktop.interface' b'gtk-theme' b"'Ambiance'" InstallationDate: Installed on 2017-09-23 (0 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1719153/+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