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disable encrypt swap partition

prerequisite

This setup is based on encrypt swap partition
all command bellow are run has root

disable encrypt swap partition

Turn off swap

root@laptop:/root# swapoff /dev/mapper/cryptswap

Undo the existing mapping.

root@laptop:/root# cryptsetup luksClose /dev/mapper/cryptswap

remove your encrypt swap device define in your /etc/crypttab
ajust /etc/fstab to use your real swap partition

/dev/nvme0n1p2   none   swap   discard   0   0

make your partition a swap

root@laptop:/root# mkswap /dev/nvme0n1p2

activate swap

root@laptop:/root# swapon -a

remove file /etc/initramfs-tools/conf.d/resume

root@laptop:/root# rm /etc/initramfs-tools/conf.d/resume

Register these changes.

root@laptop:/root# update-initramfs -u -k all
update-initramfs: Generating /boot/initrd.img-5.4.0-37-generic
cryptsetup: ERROR: Couldn't resolve device rpool/ROOT/ubuntu_0ctpm6
cryptsetup: WARNING: Couldn't determine root device
I: The initramfs will attempt to resume from /dev/nvme0n1p2
I: (UUID=09c1daa8-a572-41b9-8655-c38ea7778723)
I: Set the RESUME variable to override this.
root@laptop:/root#

Change your /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT to point to your real partition

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=09c1daa8-a572-41b9-8655-c38ea7778723"

root@laptop:/root# update-grub

Next you need to reboot to enable everything and test it.