diff --git a/debian/changelog b/debian/changelog
index f5b9025f..87856c72 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+livecd-rootfs (0.101) UNRELEASED; urgency=low
+
+  * Write out the total size of uncompressed squashfs to be used by
+    partman and ubiquity.
+
+ -- Evan Dandrea <evand@ubuntu.com>  Wed, 18 Nov 2009 12:08:48 -0600
+
 livecd-rootfs (0.100) karmic; urgency=low
 
   * UNR LIVELIST: list lupin-casper and laptop-detect explicitly and drop
diff --git a/livecd.sh b/livecd.sh
index 4b4107bc..22e9b645 100755
--- a/livecd.sh
+++ b/livecd.sh
@@ -614,6 +614,12 @@ Pin-Priority: 550
   # else needs to be run in the chroot (umounting it earlier breaks rm):
   cleanup
 
+  # Squashfs does not report unpacked disk space usage, which is explained at
+  # <http://lkml.org/lkml/2006/6/16/163>.  However, we would like to cache this
+  # number for partman's sufficient free space check and ubiquity's
+  # installation progress calculation.
+  du -sx --block-size=1 ${ROOT} | cut -f1 > livecd.${FSS}.size || true
+
   livefs_squash()
   {
     squashsort="http://people.ubuntu.com/~tfheen/livesort/${FSS}.list.${TARGETARCH}"