Completion in maxima-mode (emacs) is broken in Ubuntu 10.04



Colleagues,
I'm using maxima-mode in emacs in Ubuntu 10.04. The problem is that
completion (bound to Esc-Tab) is broken. For instance, when I write

intergrat

in a text buffer and press <Esc-Tab>, I get the following message in minibuffer:

comint-dynamic-simple-complete: Wrong number of arguments:
#[(completions) "??!?	?\"
=?_

(this is not the end of the message, but I cannot even copy the whole one)

So, what's wrong and how I can solve this?

Sincerely,
Ilya