fix ubiquity preseeding, maybe

customize.sh

@@ -19,19 +19,16 @@ cat >> ${ISO}/preseed/nilmdbuntu.seed <<"EOF"
 # Commands to run on successful install:
 # - Regenerate SSH host keys
 # - Remove "quiet splash" from grub command line
-d-i preseed/late_command string \
-    in-target sh -c "rm /etc/ssh/ssh_host_*"; \
-    in-target dpkg-reconfigure openssh-server; \
-    in-target sed -i -s -e 's/quiet splash//g' /etc/default/grub; \
-    in-target update-grub; \
-    echo "done"
-
-# Ubiquity doesn't actually use preseed/late_command, so copy those.
-# If these end up running twice, it's KK.
+# Ubiquity doesn't actually use preseed/late_command, so we do it
+# in ubiquity/success_command (which needs things mounted)
 ubiquity ubiquity/success_command string \
-    in-target sh -c "rm /etc/ssh/ssh_host_*"; \
+    for i in /dev /dev/pts /dev/shm /sys /sys/kernel/security /proc /cdrom; do \
+        mount --bind $i target/$i; done; \
+    sed -i -e 's/quiet splash//g' /target/etc/default/grub; \
+    chroot /target update-grub; \
+    for i in /dev/pts /dev/shm /dev /sys/kernel/security /sys /proc /cdrom; do \
+        umount /target/$i; done; \
     in-target dpkg-reconfigure openssh-server; \
-    in-target sed -i -s -e 's/quiet splash//g' /etc/default/grub; \
     in-target update-grub; \
     echo "done"