I've already tried with or without the trailing slash, but it gave the same results. The problem is that I'm no longer using FingerTerm to run the qchroot command. And by the way, when I used it, the error message was about mounting on loop0 or something (see the other thread), but had nothing to do with libgtk-x11-2.0.so.0. Here I have this error when using a default Terminal application, or MTermite.

P.S.
HoldgerN is the only one who deserves to be cited in FAQ #3, he was the one who find what caused the problem. I just reported the problem.