(lightdm-gtk-greeter:2875): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1175:60: Failed to open file '/usr/share/themes/Greybird-lightdm/gtk-2.0/resize_grip.png': No such file or directory

(lightdm-gtk-greeter:2875): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1240:50: Failed to open file '/usr/share/themes/Greybird-lightdm/gtk-3.0/progressbar.png': No such file or directory

(lightdm-gtk-greeter:2875): Gtk-WARNING **: Theme parsing error: gtk.css:76:29: Failed to import: Error opening file: No such file or directory

(lightdm-gtk-greeter:2875): Gtk-WARNING **: Theme parsing error: gtk.css:77:33: Failed to import: Error opening file: No such file or directory