keyboard-configuration

This days, an interesting issue occurs. I had to connect a physical keyboard to a BBB via USB. It works fine, and I tried to configure this thing with

dpkg-reconfigure keyboard-configuration
So long, this starts and I did my config in. After the reboot, the old keyboard config is still existing, all
changes didn’t work.
/etc/default/keyboard
is upset with the right settings (german in this case).
Normally this is a standard linux setting and not specially a BBB issue. Is there a link or another system entry which captures this? Is it possible to update anything? I didn’t found anything, am I mad?