Huh. Just for fun I decided to disable the openweather extension in Tweak Tool and reboot. All those messages went away...
-- 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/1779907 Title: Object St.BoxLayout has been already deallocated - impossible to connect to signal. Status in gnome-shell package in Ubuntu: New Bug description: On system boot, syslog is filled with messages of the form: Object St.BoxLayout (0x55736a43df40), has been already deallocated - impossible to connect to signal. This might be caused by the fact that the object has been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs Object St.Label (0x55736a684930), has been already finalized. Impossible to set any property to it. followed by stack traces followed by more messages of the form Object St.Label (0x55736a684930), has been already finalized. Impossible to set any property to it. These seem to relate to specific resource:///... extensions such as ubuntu-doc, openweather-extension, and so on. There are also assertions that fail of the form clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-shell 3.28.1-0ubuntu2 ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18 Uname: Linux 4.15.0-24-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Tue Jul 3 09:53:35 2018 DisplayManager: gdm3 InstallationDate: Installed on 2017-10-07 (268 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926) SourcePackage: gnome-shell UpgradeStatus: Upgraded to bionic on 2018-05-15 (48 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1779907/+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