K3b for Trinity

I have Trinity set up on Squeeze and now want to install K3b. I most emphatically do NOT want anything KDE4. How do I set about it? Alternatively, a search of my emails retrieves the information that many of you have K3b by default. The fact that I do not have it, suggests that I did not install Trinity correctly, although I thought that I had meticulously followed the directions on Timothy's site. What ought I to have done, to have what I would regard as the sine qua non of a functional DE? (Of which K3b forms a part.) Thanks, Lisi