Comment 1 for bug 198483

console-data is no longer installed by default and is no longer used or supported. (Actually install-keymap lives in console-common, but the same applies to that.) Ideally you need to use something involving console-setup.

The modern approach to what I think you're trying to do would be to add support for this keymap to XKB; at that point you can select the right layout and variant in /etc/default/console-setup, run 'setupcon --save', and run 'update-initramfs -u'.

It looks kind of tricky to come up with a variant of install-keymap that still works with the new world order, unfortunately ...