:-) Well, I'm glad you know exactly what you want to do.
Let me replay conversation:
You: Hey I'm trying to do X, but it's broken.
You: Oh, no, I figured out how to do X.
Untangler: That's the wrong way to do X.
CTO of Untangle: You've borked that box.
Untangler: Installing webmin is a bad idea.
You: Hey, but my router config isn't working right, why not?
Me: It's clear you're messing with stuff you don't understand. By opening the box up to the regular debian sources your box is going to get in an unknown state and webmin is a big security risk on an external box and why do you need webmin to modify the sshd settings?
You: Ahh, you guys are dumb. I know exactly what I'm doing.
Me: Have a good time.