Can't install bitmask experimental on Ubuntu 14.04

I'm not able to install bitmask experimental on Ubuntu 14.04 32bits.

I followed the instructions on http://deb.leap.se/experimental/ with some tweaks

$ cat /etc/apt/sources.list.d/bitmask.list
deb http://deb.leap.se/experimental trusty main
deb-src http://deb.leap.se/experimental trusty main

$ gpg --recv-key 0x1E34A1828E207901
$ gpg --armor --export 0x1E34A1828E207901  | sudo apt-key add - 
OK

$ sudo apt-get update
...

$ sudo apt-get install bitmask python-zmq  # added python-zmq on purpose to see the version problem
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 bitmask : Depends: python-zmq (>= 14.3.1-2) but 14.0.1-1build2 is to be installed
           Depends: leap-keymanager but it is not going to be installed
           Depends: leap-mail (>= 0.3.9) but it is not going to be installed
           Recommends: xul-ext-bitmask but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Looking on https://squirrel.leap.se:8080/job/python_zmq-binaries/architecture=i386,distribution=trusty/ I see that the 14.3.1-2 version is correctly created so maybe I'm doing something wrong.

(from redmine: created on 2014-11-04, closed on 2014-11-12, relates #6023 (closed))