Error activating XKB configuration.
It can happen under various circumstances:
- a bug in libxklavier library
- a bug in X server (xkbcomp, xmodmap utilities)
- X server with incompatible libxkbfile implementation

X server version data:
The X.Org Foundation
70200000

If you report this situation as a bug, please include:
- The result of xprop -root | grep XKB
- The result of gconftool-2 -R /desktop/gnome/peripherals/keyboard/kbd

---------

_XKB_RULES_NAMES_BACKUP(STRING) = "xorg", "pc105", "us", "", ""
_XKB_RULES_NAMES(STRING) = "xorg", "pc105", "de", "", ""

---------

 layouts = [de,neo_de   nodeadkeys,us]
 model = 
 options = [grp grp:alts_toggle,grp     grp:ctrls_toggle]
 overrideSettings = true



Solved: 
copy the neo_de file to the new folder /usr/share/X11/xkb/symbols/