I solved it!!
But... in a different way:
As
ROOT I checked:
etc/passwd
The new user was not there (obviously).
Then with:
Code:
sudo adduser <username>
I did manage to create the account. Then afterwards I checked
etc/passwd and this time the user was there.
Logged in as that user, which now worked, so the problem was solved through these steps.
So my guess is that the graphical
"User and Groups" utility contains a bug, so that it can't create a new user account if the user already exists in /home/<username>
Because doing exactly the same thing through the good old terminal succeeded whilst the graphical shell refused to do so.
Solved!
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