It appears I can reproduce the message by changing wallpapers. Maybe your system is set to automatically change wallpaper every 10 minutes or so, so you will keep getting the message.
** Changed in: gnome-shell (Ubuntu) Status: Incomplete => New ** Changed in: gnome-shell (Ubuntu) Importance: Undecided => Low ** Changed in: gnome-shell (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1787822 Title: gnome-shell[2503]: Object Meta.Background (0x561c9af53600), has been already deallocated - impossible to access to it To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1787822/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs