Ubuntu: Can't Boot Original OS (Ubuntu) After Booting a Live Kali Version


I can't boot Ubuntu 16.04 LTS, after I booted Kali Live from an USB-Stick.

The complete HDD is encrypted (first decryption of Drive then booting of Ubuntu), so technically Kali shouldn't be able to access it. (I did the Encryption during the installation of Ubuntu)

In my first Kali session I did only a few things, so the field of possible reasons is (hopefully) narrowed down a bit.

I downloaded the current Kali-Version as .iso from Kali.com and made a bootable USB-Stick. I tried to make it persistent (via Terminal) but it wouldn't work, so i left it.

Booted Laptop, chose Kali persistent in the menu, when the system was booting I could see a lot of errors passing too quickly to read, maybe it was about the "Persistence" or just the Update-Failures (I booted offline, so there are always some errors)

I browsed a little bit around the pre installed packages, trying to understand what these program are doing.

During the trying and testing, one program asked for the encryption key of the hard drive, but I didn't enter it and aborted that task.

I used guymager to clone the bootable USB-Stick into the Harddrive (it's a 1 TB Hard drive, with Ubuntu and the rest of my data on it) Seems like quite a stupid idea now, but i wanted to see, if Kali is able to copy stuff on the hard-drive circumventing the encryption.

After cloning, nothing special happened and I continued my "window shopping"

I shut down the computer, pulled out the USB-Stick and powered on the laptop again.

But since then, instead of asking for the Hard-Drive-Encryption or even booting Ubuntu I always start again at the Kali-Selection-Menu. And it's never persistent, so after every boot i always have to rearrange the W-Lan-Antenna and retype the Password and stuff like that. It's the same whether I try to boot with the USB in or out.

Since then I don't have access to the original data on the drive.

I tried to delete the Kali Partition on the 1TB-Hard-Drive (via Guymager) but of course this didn't work.

I tried almost all possible combinations of boot-orders in BIOS, deactivated USB-Booting, did put Boot OS System on top, but it didn't work.

I assume the original OS and all my data is still there. I think i partitioned something like 30 gigs for the OS and the rest is probably about maximum 100 to 150 gb, so there is a good chance that the Kali-Live-Clone has been put on empty space of the hard drive.

How can I undo this mistake? Is it possible to somehow reinstall the Ubuntu bootloader and access my old OS?

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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