Nautilus doesn't work.... from command or from unity

Nautilus doesn't work.... from command or from unity

I had a little bit of a problem when I uninstalled Gnome3 from my laptop
(made it slower), and packages might have uninstalled a few things that
nautilus needed in that process. Now, when I click nautilus from Unity
side bar, it doesn't do anything. I type nautilus in terminal, and this is
what it outputs:
tommydrum@crazypeople-ubuntu:~$ nautilus
Could not register the application:
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface
`org.gtk.Actions' on object at path /org/gnome/Nautilus
When I right click nautilus from unity and click a subfolder, it works,
but not when I type nautilus /home/tommydrum/Downloads. When I run
nautilus as root, this happens (it does work, but this is output):
tommydrum@crazypeople-ubuntu:~$ sudo -i nautilus
[sudo] password for tommydrum:
(nautilus:14182): Gtk-WARNING **: Failed to register client:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.gnome.SessionManager was not provided by any .service files
Initializing nautilus-dropbox 1.4.0
Initializing nautilus-open-terminal extension
(opens now..) (then I close it, goes back to commandline)
Any ideas what package I could reinstall? Or what package I might have
uninstalled by accident.