I'm sorry I couldn't give you a solution as a Debian user as well. But it turns out that I don't know how Kali works in particular.
WE DID IT!
Special thanks to Mr. Saibene from Archentina! Everything is back and not a single scratch.
It was not possible to chroot into Partition 5, cause I installed some anti-chkrootkit.
But we stored the information in the terminal on the broken Kali.
I rooted into Partition 5 and opened the Terminal in the shell, before fully booting up.
In the terminal I found the information stored, provided from Mr. Saibenes .txt routine.
It needed 25 min to run it thru, but after update and reboot. Here we are!
Thank you folks!
And By The Way,
I read long time ago about your attempt to run Orbiter in Linux. And with the runtimes and WINE... something with Vulcan???
Kali is the solution. You can use Ubuntu stuff and Debian stuff together. Gnome and KDE and xfce and Wayland in one distribution.
You should give it a try to fix the Orbiter on Linux problems with Kali!
And by the way. I use MX-Linux as a secondary system. It is also based on Arch. But I don't tell everyone btw. Arch is to me: Why simple if you can do it complicated?
And there are plenty of memes about "Btw. I use Arch.". Among Nerds, Arch-users are kind of Nerds.
What other distros did you try for Orbiter on Linux???
BTW I Use Arch is a catchphrase used to make fun of the type of person who feels superior because they use a more difficult Linux distribution. Memes about ArchLinux users being nerds have appeared online as early as 2011 and are likely inspired by troubleshooting posts by Arch users trying to...knowyourmeme.com