Mdthbs

I didn't encrypt my root partition when I was installing my Ubuntu 18.04 when 18.04 first came out (first few months of it's release)
So for reasons I decided to encrypt it now.

I know this question has been asked before (I posted the links of some of the asked ones, actually!) but I posted this because this issue is specific to me, so please don't remove my question, thank you very much, dear moderators and admins. I did not find anyone who had an issue same as mine, and after doing some MAJOR linux stuff, I had to ask for help since I was unable to solve this by myself. (Which hasn't happened a lot over my past 11 years of GNU/Linux-*nix experience. I solved/fixed my problems by myself and dear Google like 99% of the times... and as you know problems happen a lot in linux! :D )

Anyway, Here are the steps of which I did it: (In a 18.04 live usb)

sudo cryptsetup -v -y -c aes-xts-plain64 --key-size 512 --hash sha512 luksFormat --uuid=049172c6-5376-4b9c-bd27-b503b6f25423 /dev/sda5

sudo cryptsetup -v luksOpen /dev/sda5 myroot

sudo mkfs.ext4 -m 0 /dev/mapper/myroot

#Then for copying the contents of my root partition I used dd:

sudo dd if=/dev/sda6 of=/dev/mapper/myroot bs=4M

#/dev/sda6 is a duplicate of my original sda5 root...

#After I dd'ed, there was unallocated space on the partition so I did a check on it in GParted (Which also applies cryptsetup resize command to it)

sudo mount /dev/mapper/myroot /media/myroot #I created /media/myroot beforehands

Then after this I did A LOT of things I thought would help for booting this new encrypted root of mine with GRUB, and also A LOT OF MORE things I found by searching. So I basically tried everything people suggested in these links:

https://askubuntu.com/questions/1134998/booting-19-04-from-luks-system-drive

Set initramfs to prompt for luks passowrd on startup on Mint 18?

https://askubuntu.com/questions/1006867/cant-get-ubuntu-to-boot-from-luks-lvm-group-on-external-drive-on-imac-with-re

https://askubuntu.com/questions/729673/ubuntu-full-disk-encryption-with-encrypted-boot

https://askubuntu.com/questions/450895/mount-luks-encrypted-hard-drive-at-boot

https://askubuntu.com/questions/1082131/how-to-get-grub-to-boot-from-a-newly-encrypted-partition

(And a lot of more links)

Here's the output of fdisk -l:

Disk /dev/sda: 238.5 GiB, 256060514304 bytes, 500118192 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: gpt

Disk identifier: FE0857E8-E0DE-40A0-96C5-C4FEC80B8742



Device         Start       End   Sectors   Size Type

/dev/sda1       2048    534527    532480   260M EFI System

/dev/sda2     534528   1067007    532480   260M EFI System

/dev/sda3    2582528   4630527   2048000  1000M Lenovo boot partition

/dev/sda4    4892672 259438591 254545920 121.4G Microsoft basic data

/dev/sda5  259438592 332343295  72904704  34.8G Linux filesystem

/dev/sda6  332343296 400898047  68554752  32.7G Linux filesystem

/dev/sda7  410068992 425521151  15452160   7.4G Microsoft basic data

These are my UUIDs:

/dev/sda5:

LUKS UUID: 049172c6-5376-4b9c-bd27-b503b6f25423

Partition UUID: 1db5df50-7000-48df-a281-74bad5689ce1



/dev/sda6:

Former UUID which I recently changed it to a new one because it was same as sda5's due to using dd for copying root filesystem to new LUKS partition: 1db5df50-7000-48df-a281-74bad5689ce1

New UUID: 7876a195-7219-4440-892a-61b57c706443

And finally the things I tried in GRUB:
http://s000.tinyupload.com/index.php?file_id=00739971820320475700

Any help will be much appreciated I really don't want to reinstall and encrypt from the installer, I need the things I have on my ubuntu and I really can't do a reinstall, this ubuntu install of mine is just so perfect, I've had a lot of experience with GNU/Linux (Over 10 years now) and had a lot of linux installations and I'm no noob, but I just can't loose all my data or configurations or customizations I made... I know I can back them up but I just... you know?