Hello.
I encountered the exact same issue on Stretch. I just reinstalled my computer
and then just wanted to move my root LVM volume to another one. I really don't
know what I did wrong since it's not the first time I'm doing such things but
well I may have done something bad that messed it up....
Anyway after executing dpkg-reconfigure keyboard-configuration I got off the
mud.
Regards
Hervé
