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+# Ubuntu 20.04LTS installation into the LVM on the LUKS volume. 
+
+```bash
+# ------------------  Create the partitions  ------------------
+# Promote to the root user
+sudo -i
+
+```
+```bash
+
+# Setup the passphrase of the crypt partition
+read -sr PASSPHRASE
+
+```
+```bash
+
+# ------------------  Parameter setting  ------------------
+# export to share with entire script
+export PASSPHRASE
+
+# Device and partition setting. If you wan to MAKE /dev/sda2 as linux root partition,
+# set the DEV and ROOTPARTITION to /dev/sda and 2, respectively.
+# EFI partition is usualy fixed as partition 1. 
+export DEV="/dev/sda"
+export EFIPARTITION=1
+export ROOTPARTITION=2
+
+# Usually, following names are left unchanged unless existing volumes uses them.
+export CRYPTPARTITION="luks_volume"
+export VGNAME="vg1"
+export LVSWAP="swap"
+export LVROOT="ubuntu"
+
+# ROOTSIZE is percentage to the free spage in the volume group. 
+# 50% mean, new partition will use 50% of the free space in the LVM volume group. 
+export SWAPSIZE="8G"
+export ROOTSIZE="50%FREE"
+
+
+# ------------------  Create the partitions  ------------------
+
+# Optional : Create partitions for in the physical disk. 
+# Assign 100MB and rest of disk to the EFI and LUKS partition, respectively.
+sgdisk --zap-all "${DEV}"
+sgdisk --new=${EFIPARTITION}:0:+100M --change-name=${EFIPARTITION}:"EFI System" --typecode=${EFIPARTITION}:ef00 "${DEV}"
+sgdisk --new=${ROOTPARTITION}:0:0     --change-name=${ROOTPARTITION}:"Linux LUKS" --typecode=${ROOTPARTITION}:8309 "${DEV}"
+sgdisk --print "${DEV}"
+
+# Format the EFI partition by FAT32. 
+mkfs.vfat -F 32 -n EFI-SP "${DEV}${EFIPARTITION}"
+
+```
+```bash
+# ------------------  Encrypt the volume to install and test  ------------------
+
+# Encrypt the partition to install the linux
+printf %s "${PASSPHRASE}" | cryptsetup luksFormat --type=luks1 --key-file - --batch-mode "${DEV}${ROOTPARTITION}"
+
+# Open the created crypt partition. To be sure, input the passphrase manually
+cryptsetup open  "${DEV}${ROOTPARTITION}" ${CRYPTPARTITION}
+
+# Check whether successful open. If mapped, it is successful. 
+ls -l /dev/mapper
+
+```
+```bash
+# ------------------  LVM configuration  ------------------
+
+# Create the Physical Volume and Volume Group. 
+pvcreate /dev/mapper/${CRYPTPARTITION}
+vgcreate ${VGNAME} /dev/mapper/${CRYPTPARTITION}
+
+# Optional : Create the SWAP Logical Volume on VG, if volume size is not 0.
+if [  $SIZE != "0"  -a  $SIZE != "0G"  ] ; then lvcreate -L SWAPSIZE -n ${LVSWAP} ${VGNAME} ; fi
+
+# Create the ROOT Logical Volume on VG. 
+lvcreate -l ROOTSIZE -n ${LVROOT} ${VGNAME}
+
+```
+```bash
+# ------------------  Run the ubiquity installer here ------------------
+
+# ------------------  Configuratte the target GRUB during the Ubiquity runs ------------------
+# Make target GRUB aware to the crypt partition
+echo "GRUB_ENABLE_CRYPTODISK=y" >> /target/etc/default/grub
+
+```
+```bash
+# ------------------  Wait the end of Ubiquity ------------------
+# ------------------  Mount the targets ------------------
+# Mount the volume and change root
+# /target is created by the Ubiquity installer
+mount /dev/mapper/${VGNAME}-${LVROOT} /target
+for n in proc sys dev etc/resolv.conf; do mount --rbind "/$n" "/target/$n"; done
+chroot /target /bin/bash
+```
+```bash
+
+# ------------------ Add auto decryption to the target kernel -----------------
+# Mount the rest of partitions by target /etc/fstab
+mount -a
+
+# Set up the kernel hook of encryption
+apt install -y cryptsetup-initramfs
+echo "KEYFILE_PATTERN=/etc/luks/*.keyfile" >> /etc/cryptsetup-initramfs/conf-hook
+echo "UMASK=0077" >> /etc/initramfs-tools/initramfs.conf
+
+# Prepare the key file for auto decryption
+mkdir /etc/luks
+dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1
+chmod u=rx,go-rwx /etc/luks
+chmod u=r,go-rwx /etc/luks/boot_os.keyfile
+
+# Make the keyfile
+printf %s "${PASSPHRASE}" | cryptsetup luksAddKey -d - "${DEV}${ROOTPARTITION}" /etc/luks/boot_os.keyfile
+
+# Add the LUKS partition to /etc/crypttab to decrypt automatically 
+echo "${CRYPTPARTITION} UUID=$(blkid -s UUID -o value ${DEV}${ROOTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
+
+# Finally, update the ramfs initial image with the key file. 
+update-initramfs -uk all
+
+```
+```bash
+#  ------------------ Finishing installation -----------------
+exit
+reboot
+
+```
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