FYI ibus-setup (invoked by Applications > Settings Manager > IBus Preferences) does not work in BCE because it executes the local python3 instead of the sytem python3, and a library is missing. This means a user can't easily turn on the IBus Daemon to switch keyboard layouts.
I've submitted this as a bug to Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/ibus/+bug/1611523Until it is fixed upstream I've added this to my bootstrapping:
perl -pi -e 's#exec python3#exec /usr/bin/python3#' /usr/bin/ibus-setup
You might want to apply a similar fix in BCE. Switching keyboards isn't needed out of the box in BCE since there is only one, but we've definitely had users ask about installing others (and our BCE-derivative ships with an additional keyboard layout as well).
Best,
ronald