diff -Nru ltsp-5.18.12/debian/changelog ltsp-5.18.12/debian/changelog
--- ltsp-5.18.12/debian/changelog	2019-05-27 11:58:46.000000000 +0000
+++ ltsp-5.18.12/debian/changelog	2019-05-29 20:02:07.000000000 +0000
@@ -1,3 +1,10 @@
+ltsp (5.18.12-3) unstable; urgency=medium
+
+  * ltsp-client-builder: Add --trust-file-mirror to ltsp-build-client
+    options to fix builds from unsigned CDs (Closes: #929735).
+
+ -- Vagrant Cascadian <vagrant@debian.org>  Wed, 29 May 2019 13:02:07 -0700
+
 ltsp (5.18.12-2) unstable; urgency=medium
 
   [ Frans Spiesschaert ]
diff -Nru ltsp-5.18.12/debian/ltsp-client-builder.templates ltsp-5.18.12/debian/ltsp-client-builder.templates
--- ltsp-5.18.12/debian/ltsp-client-builder.templates	2019-05-27 11:33:06.000000000 +0000
+++ ltsp-5.18.12/debian/ltsp-client-builder.templates	2019-05-29 19:23:24.000000000 +0000
@@ -29,7 +29,7 @@
 
 Template: ltsp-client-builder/build-client-opts
 Type: string
-Default: --mirror file:///media/cdrom --security-mirror none --updates-mirror none --accept-unsigned-packages
+Default: --mirror file:///media/cdrom --security-mirror none --updates-mirror none --accept-unsigned-packages --trust-file-mirror
 # Only used for preseeding arguments to ltsp-client-builder.
 Description: for internal use: arguments for ltsp-build-client:
  this option is meant to be used with debconf preseeding.