diff --git a/debian/changelog b/debian/changelog
index c2cebf66..5229ac44 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,19 @@
+livecd-rootfs (2.607) eoan; urgency=medium
+
+  * snap seeding: Defer validation for regular image builds. When getting the
+    list of snaps to include on an image via germinate, we process the snaps
+    in alphabetical order. Currently we seed several packages `gnome-foo` and
+    also `gtk-common-themes`, the default provider of `gtk-3-themes`. Since
+    `gtk-common-themes` is alphabetically after `gnome-foo`, the `seed.yaml`
+    we generate is invalid when we are part way through generating. What we
+    really care about, though, is not that the `seed.yaml` is always valid at
+    every step, but it is that it is valid at the *end* of seeding.  So for
+    the germinate case, let's defer validation to happen once at the end.
+    Other callsites of `snap_preseed`, where callers are careful to seed snaps
+    in the right order, are unaffected by this.
+
+ -- Iain Lane <iain.lane@canonical.com>  Mon, 02 Sep 2019 14:22:49 +0100
+
 livecd-rootfs (2.606) eoan; urgency=medium
 
   * Undivert update-initramfs more carefully: previously the wrapper script
diff --git a/live-build/auto/build b/live-build/auto/build
index 17c5e228..a625c336 100755
--- a/live-build/auto/build
+++ b/live-build/auto/build
@@ -83,10 +83,11 @@ Setup_cleanup
 preinstall_snaps() {
 	lb chroot_resolv install
 	snap_prepare chroot
-    
+
 	for snap in "$@"; do
-		snap_preseed chroot "${snap}"
+		SNAP_NO_VALIDATE_SEED=1 snap_preseed chroot "${snap}"
 	done
+	snap_validate_seed chroot
 	lb chroot_resolv remove
 }
 
diff --git a/live-build/functions b/live-build/functions
index ee2bc2f8..9bbab33a 100644
--- a/live-build/functions
+++ b/live-build/functions
@@ -650,13 +650,22 @@ snap_preseed() {
             ;;
     esac
 
-
     # Do basic validation of generated snapd seed.yaml, doing it here
     # means we catch all the places(tm) that snaps are added but the
     # downside is that each time a snap is added the seed must be valid,
-    # i.e. snaps with bases need to add bases first etc.
-    if [ -e chroot/var/lib/snapd/seed/seed.yaml ]; then
-        snap debug validate-seed "$CHROOT_ROOT/var/lib/snapd/seed/seed.yaml"
+    # i.e. snaps with bases need to add bases first etc
+    #
+    # Skip validation by setting SNAP_NO_VALIDATE_SEED=1.
+    if [ -z "${SNAP_NO_VALIDATE_SEED}" ]; then
+        snap_validate_seed "${CHROOT_ROOT}"
+    fi
+}
+
+snap_validate_seed() {
+    local CHROOT_ROOT=$1
+
+    if [ -e "${CHROOT_ROOT}/var/lib/snapd/seed/seed.yaml" ]; then
+        snap debug validate-seed "${CHROOT_ROOT}/var/lib/snapd/seed/seed.yaml"
     fi
 }