diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec8b588..221ac3f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ Record of the modification in project development.
 - [Issue 5 : OVERWRITEINSTALL confirmation is missing](https://github.com/suikan4github/kaiten-yaki/issues/5)
 - [Issue 6 : Remove loglevel dependency from the void-kaiten-yaki.sh ](https://github.com/suikan4github/kaiten-yaki/6)
 - [Issue 7 : Add the return status validation ](https://github.com/suikan4github/kaiten-yaki/7)
+- [Issue 11 : Make chroot'ed job independent script file ](https://github.com/suikan4github/kaiten-yaki/11)
 
 ### Deprecated
 ### Removed
diff --git a/INSTALL.md b/INSTALL.md
index 5954a89..bdc6685 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -32,8 +32,11 @@ xbps-install -Su xbps nano
 ```
 The nano is an editor package to configure the config.txt. The choice of editor is up to you. Kaiten-yaki script doesn't have a dependency on nano editor.
 
-Then, edit the config.txt. 
-
+And then, go to the kaiten-yaki/script directory. 
+```bash
+cd /the/downloaded/directory/kaiten-yaki/script
+```
+Now, ready to configure. 
 ## Configuration parameters
 This is a very critical part of the installation. The configuration parameters are in the config.sh. Edit these parameters before the installation. 
 
diff --git a/script/lib/chrooted_job_ubuntu.sh b/script/lib/chrooted_job_ubuntu.sh
new file mode 100644
index 0000000..ed16912
--- /dev/null
+++ b/script/lib/chrooted_job_ubuntu.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+
+# Include configuration. This sript file have to be executed at Kaiten-yaki/script dir
+# shellcheck disable=SC1091
+source config.sh
+
+# Create a key file for LUKS and register it as contents of the initramfs image
+function chrooted_job() {
+	# Mount the rest of partitions by target /etc/fstab
+	mount -a
+
+	# Set up the kernel hook of encryption
+	echo "...Installing cryptsetup-initramfs package."
+	apt -qq install -y cryptsetup-initramfs
+
+	# Prepare a key file to embed in to the ramfs.
+	echo "...Prepairing key file."
+	mkdir /etc/luks
+	dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
+	chmod u=rx,go-rwx /etc/luks
+	chmod u=r,go-rwx /etc/luks/boot_os.keyfile
+
+	# Add a key to the key file. Use the passphrase in the environment variable. 
+	echo "...Adding a key to the key file."
+	printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
+
+	# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.  
+	echo "...Adding LUKS volume info to /etc/crypttab."
+	echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
+
+	# Putting key file into the ramfs initial image
+	echo "...Registering key file to the ramfs"
+	echo "KEYFILE_PATTERN=/etc/luks/*.keyfile" >> /etc/cryptsetup-initramfs/conf-hook
+	echo "UMASK=0077" >> /etc/initramfs-tools/initramfs.conf
+
+	# Finally, update the ramfs initial image with the key file. 
+	echo "...Upadting initramfs."
+	update-initramfs -uk all
+
+	# Leave chroot
+}
+
+# Execute job
+chrooted_job
diff --git a/script/lib/chrooted_job_void.sh b/script/lib/chrooted_job_void.sh
new file mode 100644
index 0000000..ee58369
--- /dev/null
+++ b/script/lib/chrooted_job_void.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Include configuration. This sript file have to be executed at Kaiten-yaki/script dir
+# shellcheck disable=SC1091
+source config.sh
+
+# Create a key file for LUKS and register it as contents of the initramfs image
+function chrooted_job() {
+		# Mount the rest of partitions by target /etc/fstab
+		mount -a
+
+		# Set up the kernel hook of encryption
+		echo "...Installing cryptsetup-initramfs package."
+		xbps-install -y lvm2 cryptsetup
+
+		# Prepare a key file to embed in to the ramfs.
+		echo "...Prepairing key file."
+		mkdir /etc/luks
+		dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
+		chmod u=rx,go-rwx /etc/luks
+		chmod u=r,go-rwx /etc/luks/boot_os.keyfile
+
+		# Add a key to the key file. Use the passphrase in the environment variable. 
+		echo "...Adding a key to the key file."
+		printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
+
+		# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.  
+		echo "...Adding LUKS volume info to /etc/crypttab."
+		echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
+
+		# Putting key file into the ramfs initial image
+		echo "...Registering key file to the ramfs"
+		echo 'install_items+=" /etc/luks/boot_os.keyfile /etc/crypttab " ' > /etc/dracut.conf.d/10-crypt.conf
+
+		# Finally, update the ramfs initial image with the key file. 
+		echo "...Upadting initramfs."
+		xbps-reconfigure -fa
+		echo "...grub-mkconfig."
+		grub-mkconfig -o /boot/grub/grub.cfg
+
+		# Leave chroot
+}
+
+# Execute job
+chrooted_job
diff --git a/script/lib.sh b/script/lib/common.sh
similarity index 88%
rename from script/lib.sh
rename to script/lib/common.sh
index 82b0ffc..11c3fbd 100644
--- a/script/lib.sh
+++ b/script/lib/common.sh
@@ -124,7 +124,7 @@ function confirmation(){
 
 
 # ******************************************************************************* 
-#                                Pre-install stage 
+#                           Common Pre-install stage 
 # ******************************************************************************* 
 
 function pre_install() {
@@ -283,6 +283,53 @@ function para_install_msg() {
 	return 0
 }
 
+
+# ******************************************************************************* 
+#                  Common post-install stage
+# ******************************************************************************* 
+# In side this script, the chrooted job is parameterrized as by evn variable TARGETCHROOTEDJOB
+function post_install() {
+	## Mount the target file system
+	# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
+	echo "...Mounting /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
+	mount /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" "${TARGETMOUNTPOINT}"
+
+	# And mount other directories
+	echo "...Mounting all other dirs."
+	for n in proc sys dev tmp etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
+
+	# Copy all scripts to the target /tmp
+	echo "...Copy files in current dir to ${TARGETMOUNTPOINT}/tmp."
+	mkdir "${TARGETMOUNTPOINT}/tmp/kaiten-yaki"
+	cp -r ./* -t "${TARGETMOUNTPOINT}/tmp/kaiten-yaki"
+
+	# Change root and create the keyfile and ramfs image for Linux kernel. 
+	# The here document is script executed under chroot. And here we call 
+	# the distribution dependent script "lib/chrooted_job_${DISTRIBUTIONSIGNATURE}.sh".
+	echo "...Chroot to ${TARGETMOUNTPOINT}."
+	# shellcheck disable=SC2086
+	cat <<- HEREDOC | chroot "${TARGETMOUNTPOINT}" /bin/bash
+		cd /tmp/kaiten-yaki
+		# Execute copied script
+		source "lib/chrooted_job_${DISTRIBUTIONSIGNATURE}.sh"
+	HEREDOC
+
+	# Unmount all
+	echo "...Unmounting all."
+	umount -R "${TARGETMOUNTPOINT}"
+
+	# Finishing message
+	cat <<- HEREDOC
+	****************** Post-install process finished ******************
+
+	...Ready to reboot.
+	HEREDOC
+
+	return 0
+	
+} # End of post_install_local()
+
+
 # ******************************************************************************* 
 #              Deactivate all LV in the VG and close LUKS volume
 # ******************************************************************************* 
diff --git a/script/ubuntu-kaiten-yaki.sh b/script/ubuntu-kaiten-yaki.sh
index a18aa8f..96ace9b 100644
--- a/script/ubuntu-kaiten-yaki.sh
+++ b/script/ubuntu-kaiten-yaki.sh
@@ -5,14 +5,13 @@
 	source ./config.sh
 
 	# Load common functions
-	source ./lib.sh
+	source ./lib/common.sh
 
 function main() {
 
 	# This is the mount point of the install target. 
 	export TARGETMOUNTPOINT="/target"
 
-
 	# ******************************************************************************* 
 	#                                Confirmation before installation 
 	# ******************************************************************************* 
@@ -54,8 +53,9 @@ function main() {
 	#                                Post-install stage 
 	# ******************************************************************************* 
 
-	# Distribution dependent finalizing. Embedd encryption key into the ramfs image. 
-	post_install_local
+	# Distribution dependent finalizing. Embedd encryption key into the ramfs image.
+	# The script is parameterized by env-variable to fit to the distribution 
+	post_install
 
 	# Normal end
 	return 0
@@ -100,70 +100,6 @@ function para_install_local() {
 	return 0
 }
 
-# ******************************************************************************* 
-# Ubuntu dependent post-installation process
-function post_install_local() {
-	## Mount the target file system
-	# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
-	echo "...Mounting /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
-	mount /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" ${TARGETMOUNTPOINT}
-
-	# And mount other directories
-	echo "...Mounting all other dirs."
-	for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
-
-	# Change root and create the keyfile and ramfs image for Linux kernel. 
-	echo "...Chroot to ${TARGETMOUNTPOINT}."
-	# shellcheck disable=SC2086
-	cat <<- HEREDOC | chroot ${TARGETMOUNTPOINT} /bin/bash
-		# Mount the rest of partitions by target /etc/fstab
-		mount -a
-
-		# Set up the kernel hook of encryption
-		echo "...Installing cryptsetup-initramfs package."
-		apt -qq install -y cryptsetup-initramfs
-
-		# Prepare a key file to embed in to the ramfs.
-		echo "...Prepairing key file."
-		mkdir /etc/luks
-		dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
-		chmod u=rx,go-rwx /etc/luks
-		chmod u=r,go-rwx /etc/luks/boot_os.keyfile
-
-		# Add a key to the key file. Use the passphrase in the environment variable. 
-		echo "...Adding a key to the key file."
-		printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
-
-		# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.  
-		echo "...Adding LUKS volume info to /etc/crypttab."
-		echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
-
-		# Putting key file into the ramfs initial image
-		echo "...Registering key file to the ramfs"
-		echo "KEYFILE_PATTERN=/etc/luks/*.keyfile" >> /etc/cryptsetup-initramfs/conf-hook
-		echo "UMASK=0077" >> /etc/initramfs-tools/initramfs.conf
-
-		# Finally, update the ramfs initial image with the key file. 
-		echo "...Upadting initramfs."
-		update-initramfs -uk all
-
-		# Leave chroot
-	HEREDOC
-
-	# Unmount all
-	echo "...Unmounting all."
-	umount -R ${TARGETMOUNTPOINT}
-
-	# Finishing message
-	cat <<- HEREDOC
-	****************** Post-install process finished ******************
-
-	...Ready to reboot.
-	HEREDOC
-
-	return 0
-
-} # End of post_install_local()
 
 
 # ******************************************************************************* 
diff --git a/script/void-kaiten-yaki.sh b/script/void-kaiten-yaki.sh
index 87cfcd4..5838747 100644
--- a/script/void-kaiten-yaki.sh
+++ b/script/void-kaiten-yaki.sh
@@ -5,14 +5,13 @@
 	source ./config.sh
 
 	# Load common functions
-	source ./lib.sh
+	source ./lib/common.sh
 
 function main() {
 
 	# This is the mount point of the install target. 
 	export TARGETMOUNTPOINT="/mnt/target"
 
-
 	# ******************************************************************************* 
 	#                                Confirmation before installation 
 	# ******************************************************************************* 
@@ -76,7 +75,8 @@ function main() {
 	# ******************************************************************************* 
 
 	# Distribution dependent finalizing. Embedd encryption key into the ramfs image. 
-	post_install_local
+	# The script is parameterized by env-variable to fit to the distribution 
+	post_install
 
 	# Normal end
 	return 0
@@ -128,71 +128,6 @@ function para_install_local() {
 	return 0
 }
 
-# ******************************************************************************* 
-# Void Linux dependent post-installation process
-function post_install_local() {
-	## Mount the target file system
-	# ${TARGETMOUNTPOINT} is created by the GUI/TUI installer
-	echo "...Mounting /dev/mapper/${VGNAME}-${LVROOTNAME} on ${TARGETMOUNTPOINT}."
-	mount /dev/mapper/"${VGNAME}"-"${LVROOTNAME}" ${TARGETMOUNTPOINT}
-
-	# And mount other directories
-	echo "...Mounting all other dirs."
-	for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "${TARGETMOUNTPOINT}/$n"; done
-
-	# Change root and create the keyfile and ramfs image for Linux kernel. 
-	echo "...Chroot to ${TARGETMOUNTPOINT}."
-	# shellcheck disable=SC2086
-	cat <<- HEREDOC | chroot ${TARGETMOUNTPOINT} /bin/bash
-		# Mount the rest of partitions by target /etc/fstab
-		mount -a
-
-		# Set up the kernel hook of encryption
-		echo "...Installing cryptsetup-initramfs package."
-		xbps-install -y lvm2 cryptsetup
-
-		# Prepare a key file to embed in to the ramfs.
-		echo "...Prepairing key file."
-		mkdir /etc/luks
-		dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
-		chmod u=rx,go-rwx /etc/luks
-		chmod u=r,go-rwx /etc/luks/boot_os.keyfile
-
-		# Add a key to the key file. Use the passphrase in the environment variable. 
-		echo "...Adding a key to the key file."
-		printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
-
-		# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.  
-		echo "...Adding LUKS volume info to /etc/crypttab."
-		echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
-
-		# Putting key file into the ramfs initial image
-		echo "...Registering key file to the ramfs"
-		echo 'install_items+=" /etc/luks/boot_os.keyfile /etc/crypttab " ' > /etc/dracut.conf.d/10-crypt.conf
-
-		# Finally, update the ramfs initial image with the key file. 
-		echo "...Upadting initramfs."
-		xbps-reconfigure -fa
-		echo "...grub-mkconfig."
-		grub-mkconfig -o /boot/grub/grub.cfg
-
-		# Leave chroot
-	HEREDOC
-
-	# Unmount all
-	echo "...Unmounting all."
-	umount -R ${TARGETMOUNTPOINT}
-
-	# Finishing message
-	cat <<- HEREDOC
-	****************** Post-install process finished ******************
-
-	...Ready to reboot.
-	HEREDOC
-
-	return 0
-	
-} # End of post_install_local()
 
 
 # *******************************************************************************