Because of the slimmed down TurnKey installer I understand why you can't do it during install, but once installed I don't understand why you couldn't install it. Other than a few custom packages, TurnKey is basically Debian (inc vanilla Debian kernel).
Regardless I'm glad you worked around your issue. Out of curiosity did you document what didn't work? And/or use a specific tutorial or something? It might be worth us working out why it doesn't work OOTB.
That's weird...
Because of the slimmed down TurnKey installer I understand why you can't do it during install, but once installed I don't understand why you couldn't install it. Other than a few custom packages, TurnKey is basically Debian (inc vanilla Debian kernel).
Regardless I'm glad you worked around your issue. Out of curiosity did you document what didn't work? And/or use a specific tutorial or something? It might be worth us working out why it doesn't work OOTB.