Import patches-unapplied version 2.517 to ubuntu/bionic-proposed

Imported using git-ubuntu import.

Changelog parent: b3e90b4798

New changelog entries:
  [ Simon Quigley ]
  * Add proper lubuntu support in BASE_SEED.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.517) bionic; urgency=medium
+
+  [ Simon Quigley ]
+  * Add proper lubuntu support in BASE_SEED.
+
+ -- Iain Lane <iain.lane@canonical.com>  Tue, 03 Apr 2018 11:56:32 +0100
+
 livecd-rootfs (2.516) bionic; urgency=medium
 
   [ Chris Glass ]

live-build/auto/config

@@ -667,9 +667,15 @@ esac
 # we'll expand the base seed given here according to the STRUCTURE file, and
 # then look in all of the seeds found to see which snaps are seeded
 case $PROJECT:${SUBPROJECT:-} in
-	ubuntu:*|kubuntu*:*|lubuntu*:*|xubuntu*:*|ubuntu-mate*:*|ubuntustudio*:*|ubuntukylin*:*|ubuntu-budgie*:*)
+	ubuntu:*|kubuntu*:*|xubuntu*:*|ubuntu-mate*:*|ubuntustudio*:*|ubuntukylin*:*|ubuntu-budgie*:*)
 		BASE_SEED='desktop'
 		;;
+	lubuntu-next:*)
+		BASE_SEED='desktop-qt'
+		;;
+	lubuntu:*)
+		BASE_SEED='desktop-gtk'
+		;;
 	ubuntu-server:live)
 		BASE_SEED='server'
 		# subiquity is seeded but in a separate squashfs via hooks; set HOOK_SNAPS and ALL_SNAPS.