installation commands for manual installation of Ubuntu 22.04 + LUKS

gistfile1.txt

cryptsetup luksFormat --type=luks1 /dev/nvme0n1p7
cryptsetup luksOpen /dev/nvme0n1p7 cryptdrive
ls /dev/mapper/

mkfs.btrfs /dev/mapper/cryptdrive

gedit /usr/lib/partman/mount.d/70btrfs

#!/bin/sh

set -- $1

fs=$1
mp=$2
type=$3
options=$4
dump=$5
pass=$6

case $type in
    btrfs)
	options="${options%,subvol=*}"
	#for removing the option subvol,when thats the only option
	#eg: options=="subvol=@", no comma present
	options="${options%subvol=*}"
	mount -t btrfs ${options:+-o "$options"} $fs /target$mp || exit 1
	case $mp in
	    /)
		btrfs subvolume create /target$mp/@
		chmod 755 /target$mp/@
		umount /target$mp
		options="${options:+$options,}subvol=@,ssd,noatime,space_cache=v2,commit=120,compress=zstd"
		mount -t btrfs -o $options $fs /target$mp
		;;
	    /home)
		btrfs subvolume create /target$mp/@home
		chmod 755 /target$mp/@home
		umount /target$mp
		options="${options:+$options,}subvol=@home,ssd,noatime,space_cache=v2,commit=120,compress=zstd"
		mount -t btrfs -o $options $fs /target$mp
		;;
	esac
	echo "umount /target$mp"
	exit 0
	;;
esac

exit 1





gedit /usr/lib/partman/fstab.d/btrfs


#!/bin/sh

. /lib/partman/lib/base.sh

home_found="unknown"

for dev in $DEVICES/*; do
	[ -d $dev ] || continue
	cd $dev
	open_dialog PARTITIONS
	while { read_line num id size type fs path name; [ "$id" ]; }; do
		[ $fs != free ] || continue
		[ -f "$id/method" ] || continue
		[ -f "$id/acting_filesystem" ] || continue
		method=$(cat $id/method)
		filesystem=$(cat $id/acting_filesystem)
		mountpoint=$(cat $id/mountpoint)
		case "$filesystem" in
		    btrfs)
			[ -f "$id/mountpoint" ] || continue
			# due to #249322, #255135, #258117:
			if [ "$mountpoint" = /tmp ]; then
				rm -f $id/options/noexec
			fi
			options=$(get_mountoptions $dev $id)
			if [ "$mountpoint" = / ]; then
				if [ "$home_found" = "unknown" ]; then
					home_found="false"
				fi
				pass=0
				home_options="${options:+$options,}subvol=@home,ssd,noatime,space_cache=v2,commit=120,compress=zstd"
				options="${options:+$options,}subvol=@,ssd,noatime,space_cache=v2,commit=120,compress=zstd"
				home_path="$path"
				home_mp="$mountpoint"home
			elif [ "$mountpoint" = /home ]; then
				pass=0
				options="${options:+$options,}subvol=@home,ssd,noatime,space_cache=v2,commit=120,compress=zstd"
				home_found=true
			else
				pass=0
			fi
			echo "$path" "$mountpoint" btrfs $options 0 $pass
			;;
		    *)
			if [ "$mountpoint" = "/home" ]; then
				home_found="true"
			fi
			;;
		esac
	done
	close_dialog
done

if [ "$home_found" = "false" ]; then
	echo "$home_path" "$home_mp" btrfs "$home_options" 0 0
	home_found="true"
fi



ubiquity --no-bootloader



#################



mount -o subvol=@,ssd,noatime,space_cache=v2,commit=120,compress=zstd /dev/mapper/cryptdrive /mnt
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
sudo cp /etc/resolv.conf /mnt/etc/
sudo chroot /mnt

mount -av

btrfs subvolume list /

export UUIDP7=$(blkid -s UUID -o value /dev/nvme0n1p7) #this is an environmental variable
echo "cryptdrive UUID=${UUIDP7} none luks" >> /etc/crypttab

cat /etc/crypttab


export SWAPUUID=$(blkid -s UUID -o value /dev/nvme0n1p6)
echo "cryptswap UUID=${SWAPUUID} /dev/urandom swap,offset=1024,cipher=aes-xts-plain64,size=512" >> /etc/crypttab
cat /etc/crypttab


sed -i "s|UUID=${SWAPUUID}|/dev/mapper/cryptswap|" /etc/fstab
cat /etc/fstab


update-initramfs -k all -c