# Remove `gtk-theme-name=` line in `~/.gtkrc-2.0` file
# Restart `kded5`, `gtk-theme-name="Breeze"` line should appear in `~/.gtkrc-2.0` file
# Remove `gtk-theme-name=` line in `~/.config/gtk-3.0/settings.ini` file
# Restart `kded5`, `gtk-theme-name=Breeze` line should appear in `~/.config/gtk-3.0/settings.ini` file, also it should be changed in dconf in `org.gnome.desktop.interface.gtk-theme` prefix and in `~/.config/xsettingsd/xsettingsd.conf` file (`Net/ThemeName "Breeze"` line)
# Remove similar lines from previous configs, or replace them with `BreezyGTK`, `Orion` or `oxygen-gtk` and run `gtk_theme` executable from `kconf_update` build directory. It should change the GTK configs to Breeze theme.