Show splash screen by default. Enable quick boot. Enable flicker-free boot

debian/rules

@@ -88,6 +88,10 @@ else ifeq (yes,$(shell dpkg-vendor --derives-from Tanglu && echo yes))
 DEFAULT_CMDLINE := quiet splash
 DEFAULT_TIMEOUT := 10
 FLICKER_FREE_BOOT := yes
+else ifeq (yes,$(shell dpkg-vendor --derives-from PureOS && echo yes))
+DEFAULT_CMDLINE := quiet splash
+DEFAULT_TIMEOUT := 5
+FLICKER_FREE_BOOT := yes
 else
 DEFAULT_CMDLINE := quiet
 DEFAULT_TIMEOUT := 5