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

choose the /dev/mapper/crypt “device” and click on “New Partition Table”.

create swap partition at the end of the free space:

next, create your root volume occupying the rest of the free space:

rsult:

now find our boot partition, in our case /dev/nvme0n1p5, slelect it and click “Change”

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/mapper/crypt2 /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

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 PARTLABEL=crypt none luks,discard

update-initramfs -k all -c

reboot