diff --git a/ubuntu/1-pre-install.sh b/ubuntu/1-pre-install.sh
index d99ca94..2d52230 100644
--- a/ubuntu/1-pre-install.sh
+++ b/ubuntu/1-pre-install.sh
@@ -39,8 +39,19 @@ source config.sh
 
 # ----- Format the disk and encrypt the LUKS partition -----
 if [ ${ERASEALL} -eq 1 ] ; then
-# Optional : Create partitions for in the physical disk. 
-# Assign specified space and rest of disk to the EFI and LUKS partition, respectively.
+# For sure ask ready to erase. 
+	echo "Are you sure you want to erase entire ${DEV}? [Y/N]"
+	read YESNO
+	if [ YESNO != "Y" -a YESNO != "y" ] ; then
+		cat <<HEREDOC 1>&2
+Check config.sh. The ERASEALL is ${ERASEALL}.
+
+Installation terminates.
+HEREDOC
+		return
+	fi
+
+	# Assign specified space and rest of disk to the EFI and LUKS partition, respectively.
 	if [  ${ISEFI} -eq 1 ] ; then
 		# Zap existing partition table and create new GPT
 		sgdisk --zap-all "${DEV}"
@@ -108,4 +119,9 @@ HEREDOC
 	return
 fi
 
-echo "1-pre-install.sh : Done."
+cat <<HEREDOC
+
+1-pre-install.sh : Done. Next, run the Ubiquity installer.
+
+HEREDOC
+
diff --git a/ubuntu/2-para-install.sh b/ubuntu/2-para-install.sh
index 9dc5468..68ec125 100644
--- a/ubuntu/2-para-install.sh
+++ b/ubuntu/2-para-install.sh
@@ -28,4 +28,9 @@ fi
 # Make target GRUB aware to the crypt partition
 echo "GRUB_ENABLE_CRYPTODISK=y" >> /target/etc/default/grub
 
-echo "2-para-install.sh : Done."
\ No newline at end of file
+cat <<HEREDOC
+
+2-para-install.sh : Done. 
+Make sure to click "Continue Testing", when the Ubiquity installer finishes. 
+
+HEREDOC
diff --git a/ubuntu/3-post-install.sh b/ubuntu/3-post-install.sh
index f60b5c9..5dc407b 100644
--- a/ubuntu/3-post-install.sh
+++ b/ubuntu/3-post-install.sh
@@ -20,7 +20,7 @@ mount /dev/mapper/${VGNAME}-${LVROOTNAME} /target
 # And mount other directories
 for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "/target/$n"; done
 
-# Change root
+# Change root and create the keyfile and ramfs image for Linux kernel. 
 cat <<HEREDOC | chroot /target /bin/bash
 ```
 # Mount the rest of partitions by target /etc/fstab
@@ -50,4 +50,8 @@ update-initramfs -uk all
 exit
 HEREDOC
 
-echo "3-para-install.sh : Done."
\ No newline at end of file
+cat <<HEREDOC
+
+3-pro-install.sh : Done. Ready to reboot.
+
+HEREDOC