(In reply to Ruslan Kabatsayev from comment #25)
> In gtk3 the file is another: /usr/share/themes/oxygen-gtk/gtk-3.0/gtk.css
Thanks. I found the "-GtkComboBox-appears-as-list: 1;" line and changed it to 0. It doesn't crash now, although it doesn't open the directory selection dialog (AFAIR, it used to in Kubuntu 14.04, and that's how I selected the directory).
(In reply to Ruslan Kabatsayev from comment #25) themes/ oxygen- gtk/gtk- 3.0/gtk. css
> In gtk3 the file is another: /usr/share/
Thanks. I found the "-GtkComboBox- appears- as-list: 1;" line and changed it to 0. It doesn't crash now, although it doesn't open the directory selection dialog (AFAIR, it used to in Kubuntu 14.04, and that's how I selected the directory).