http://docs.software-univention.de/ucc-manual-3.0.html#config:keyboardlocale A reference should be added that xorg/keyboard/options/XkbModel should be set appropriately (e.g. pc105) to support different layouts
As this is a regression from ucc 1+2, fix it directly via erratum: r73142 univention-corporate-client 4.0.0-19.124.201610131237 r73143 yaml
OK - univention-corporate-client OK - yaml
<https://errata.software-univention.de/ucc/3.0/1.html>