Using the radio button on the install page to select German or English key layout for console my not work with all images.
It depends on the ubuntu version, for 12.04 it should be working. In dependence of the selection /etc/init/console-setup.conf is edited at first boot. The last line within this file staring with 'exec loadkeys' is activated or deactivated.
Changing a language or location setting of the LINUX GUI should be done with the GUI tool or by command line.
Application Menu → Settings → Keyboard
(Console settings are only effected if the console is a GUI console.)
via command line
With „loadkeys de“ you can set to German keyboard for the current session.
run „dpkg-reconfigure console-data“ to run the set-up.
via Xming arguments
Add “-xkbmodel pc105 -xkblayout de“ to the start up arguments in the Xming short cut in settings.txt
ATENTION! Some LINUX setting will course errors because coLinux kernel or modules want be able to support the changes. There are other files within LINUX that may effect this settings. /etc/default/console-setup and /etc/default/keyboard my also be in use. Xming Don't install anywhere other than the default directory unless you really know what you are doing, e.g. use directory 'C:\Program Files\Xming' on Windows. If Xming my also be installed within a subdirectory named Xming of your speedlinux installation. Other directorys cant be automatically recognised by the installer.
See also: x.org page