Yes deleting inside Kubuntu the folder '/etc/default/grub.d' solves it.
Forget my #4 - it will be my failure - I will look if there are former changes in the installation.
Yes deleting inside Kubuntu the folder '/etc/default/ grub.d' solves it.
Forget my #4 - it will be my failure - I will look if there are former changes in the installation.