diff -ru cryptsetup-1.6.6.orig/debian/changelog cryptsetup-1.6.6/debian/changelog
--- cryptsetup-1.6.6.orig/debian/changelog	2015-08-21 09:59:11.000000000 +0200
+++ cryptsetup-1.6.6/debian/changelog	2015-10-24 20:09:32.254274641 +0200
@@ -1,3 +1,9 @@
+cryptsetup (2:1.6.6-5ubuntu2dave1) UNRELEASED; urgency=medium
+
+  * Use plymouth in decrypt_gnupg, if available. (closes: #885358)
+
+ -- Dave Pifke <dave@pifke.org>  Sat, 24 Oct 2015 19:36:06 +0200
+
 cryptsetup (2:1.6.6-5ubuntu2) wily; urgency=medium
 
   * Fix stupid typo in Recommends "busybox | busybox-static" inversion.
diff -ru cryptsetup-1.6.6.orig/debian/scripts/decrypt_gnupg cryptsetup-1.6.6/debian/scripts/decrypt_gnupg
--- cryptsetup-1.6.6.orig/debian/scripts/decrypt_gnupg	2015-03-28 21:38:34.000000000 +0100
+++ cryptsetup-1.6.6/debian/scripts/decrypt_gnupg	2015-10-24 20:09:40.330329736 +0200
@@ -2,7 +2,12 @@
 
 decrypt_gpg () {
 	echo "Performing GPG key decryption ..." >&2
-	if ! /lib/cryptsetup/askpass "Enter passphrase for key $1: " | \
+	if [ -x /bin/plymouth ] && plymouth --ping; then
+		askpass="/bin/plymouth ask-for-password --prompt"
+	else
+		askpass=/lib/cryptsetup/askpass
+	fi
+	if ! $askpass "Enter passphrase for key $1: " | \
 		/usr/bin/gpg -q --batch --no-options --no-mdc-warning  \
 		--no-random-seed-file --no-default-keyring \
 		--keyring /dev/null --secret-keyring /dev/null \