diff --git a/script/_parainstall.sh b/script/_parainstall.sh
index d6969ac..c9ce0f2 100644
--- a/script/_parainstall.sh
+++ b/script/_parainstall.sh
@@ -2,9 +2,6 @@
 #                        Common part of para-install 
 # ******************************************************************************* 
 
-# Record the PID of the installer. 
-installer_pid=$!
-
 # While the /etc/default/grub in the install target is NOT existing, keep sleeping.
 # If installer terminated without file copy, this script also terminates.
 while [ ! -e ${TARGETMOUNTPOINT}/etc/default/grub ]
diff --git a/script/ubuntu-kaiten-yaki.sh b/script/ubuntu-kaiten-yaki.sh
index 56ade88..aa56d4b 100644
--- a/script/ubuntu-kaiten-yaki.sh
+++ b/script/ubuntu-kaiten-yaki.sh
@@ -78,6 +78,9 @@ read dummy_var
 # Start Ubiquity installer 
 ubiquity &
 
+# Record the PID of the installer. 
+installer_pid=$!
+
 # Common part of the para-install. 
 # Record the install PID, modify the /etc/default/grub of the target, 
 # and then, wait for the end of sintaller. 
@@ -88,17 +91,17 @@ source _parainstall.sh
 # ******************************************************************************* 
 
 ## Mount the target file system
-# /target is created by the Ubiquity installer
-echo "...Mount /dev/mapper/${VGNAME}-${LVROOTNAME} on /target."
-mount /dev/mapper/${VGNAME}-${LVROOTNAME} /target
+# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
+echo "...Mount /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
+mount /dev/mapper/${VGNAME}-${LVROOTNAME} ${TARGETMOUNTPOINT}
 
 # And mount other directories
 echo "...Mount all other dirs."
-for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "/target/$n"; done
+for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
 
 # Change root and create the keyfile and ramfs image for Linux kernel. 
-echo "...Chroot to /target."
-cat <<HEREDOC | chroot /target /bin/bash
+echo "...Chroot to ${TARGETMOUNTPOINT}."
+cat <<HEREDOC | chroot ${TARGETMOUNTPOINT} /bin/bash
 # Mount the rest of partitions by target /etc/fstab
 mount -a
 
@@ -133,7 +136,7 @@ HEREDOC
 
 # Unmount all
 echo "...Unmount all."
-umount -R /mnt/target
+umount -R ${TARGETMOUNTPOINT}
 
 # Finishing message
 cat <<HEREDOC
diff --git a/script/void-kaiten-yaki.sh b/script/void-kaiten-yaki.sh
index 2cbf3eb..b56abc4 100644
--- a/script/void-kaiten-yaki.sh
+++ b/script/void-kaiten-yaki.sh
@@ -89,6 +89,9 @@ else
 	void-installer &
 fi
 
+# Record the PID of the installer. 
+installer_pid=$!
+
 # Common part of the para-install. 
 # Record the install PID, modify the /etc/default/grub of the target, 
 # and then, wait for the end of sintaller. 
@@ -99,17 +102,17 @@ source _parainstall.sh
 # ******************************************************************************* 
 
 ## Mount the target file system
-# /mnt/target is created by the void-installer
-echo "...Mount /dev/mapper/${VGNAME}-${LVROOTNAME} on /mnt/target."
-mount /dev/mapper/${VGNAME}-${LVROOTNAME} /mnt/target
+# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
+echo "...Mount /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
+mount /dev/mapper/${VGNAME}-${LVROOTNAME} ${TARGETMOUNTPOINT}
 
 # And mount other directories
 echo "...Mount all other dirs."
-for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "/mnt/target/$n"; done
+for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
 
 # Change root and create the keyfile and ramfs image for Linux kernel. 
-echo "...Chroot to /target."
-cat <<HEREDOC | chroot /mnt/target /bin/bash
+echo "...Chroot to ${TARGETMOUNTPOINT}."
+cat <<HEREDOC | chroot ${TARGETMOUNTPOINT} /bin/bash
 # Mount the rest of partitions by target /etc/fstab
 mount -a
 
@@ -148,7 +151,7 @@ HEREDOC
 
 # Unmount all
 echo "...Unmount all."
-umount -R /mnt/target
+umount -R ${TARGETMOUNTPOINT}
 
 # Finishing message
 cat <<HEREDOC