Mozilla 0.9.1 won't install

[Mart van de Wege <mvdwege@wanadoo.nl>]

Folks,

I was pleasantly surprised when I found that Mozilla had finally arrived
in unstable. I fortwith tried to install it. Alas, it keeps bombing out in
the postinst script with an exit code of 5. Funny thing is that it
installed flawlessly on my laptop, but my desktop machine wants none of
it.
I tried running dpkg with debugging info on, but unfortunately that still
doesn't shed any light on the problem. Can someone give me a few pointers
as to why a postinst script would bomb with this particular error? Or how
I can trace *where* in the script the error occurs? Because as of now I
only get a very helpful message saying postinst failed with exit code 5,
and man bash wasn't very helpful either.

Mart