I did get the default.rule error (starting from terminal) when I had installed both the nautilus_3.30.0-0ubuntu1~cosmic1 and the tracker_2.1.3-1~cosmic1 packeges. As I mentioned, at that time nautilus did not start, the small wheel on the screen just kept on turning.
Then, after downgrading tracker_2.1.3-1~cosmic1 back to the official tracker_2.0.3-3, I did get nautilus_3.30.0-0ubuntu1~cosmic1 running. However, the thumbnailer did not work then. Sorry, I am not familiar with the backtrace system. -- 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/1791991 Title: Nautilus in Gnome3 Staging PPA will not start Status in nautilus package in Ubuntu: New Bug description: Nautilus version 3.30.0-0ubuntu1~cosmic1 in Gnome3 Staging PPA will not start. I am using Gnome-shell environment. And I also installed the new tracker version 2.1.3-1~cosmic1 from Gnome3 Staging PPA. This is the error message when trying to start Nautilus from terminal: Tracker-ERROR **: 20:33:14.659: Unable to find default domain ontology rule /usr/share/tracker/domain-ontologies/default.rule To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1791991/+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
