I decided to edit the question fundamentally as I found out what happend.
So long story short:
Attempted to format an sdcard with the LUKS drive connected, but closed.
(following [1])
I had some trouble getting it to work and at one point I obviously (bash_history) issued
sudo parted -s /dev/sdb mklabel gpt with /dev/sdb being the LUKS drive.
The drive now shows as /dev/sdb only.
So do I have any chance to recover the origin partition table? I am sure the device had only one partition covering the complete drive.
Many thanks in advance
Leo
[1]: How to create a mkfs.ext4 file system on an SD card that can be written to by anyone?
