dualboot ubuntu and windows with encrypted ubuntu partition

https://www.mikekasberg.com/blog/2020/04/08/dual-boot-ubuntu-and-windows-with-encryption.html

cryptsetup luksFormat –type=luks1 /dev/nvme0n1p6

cryptsetup open /dev/nvme0n1p6 crypt

pvcreate /dev/mapper/crypt

vgcreate ubuntu-vg /dev/mapper/crypt

lvcreate -L 8G -n swap ubuntu-vg

lvcreate -l 100%FREE -n root ubuntu-vg

next, click on “Install Now” to proceed with the installation.. from now on just do whatever you do to install ubuntu, but when you are done, don't reboot yet, click on “Continue Testing”

open a terminal

mount /dev/ubuntu-vg/root /mnt

mount PARTLABEL=boot /mnt/boot/

for i in dev proc sys etc/resolv.conf; do mount -o bind /$i /mnt/$i; done

chroot /mnt

blkid /dev/nvme0n1p6

nano /etc/crypttab

# <target name> <source device> <key file> <options>

# options used:

# luks - specifies that this is a LUKS encrypted device

# tries=0 - allows to re-enter password unlimited number of times

# discard - allows SSD TRIM command, WARNING: potential security risk (more: “man crypttab”)

# loud - display all warnings

crypt UUID=“879761ba-42bc-455a-9126-fd21fa386f07” none luks,discard

update-initramfs -k all -c

exit

reboot