cannot start leap client 0.3.8.4+0 anymore

on linux64, with latest ubuntu client:

--- leap/client » bitmask
Traceback (most recent call last):
  File "/usr/bin/bitmask", line 5, in 
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2809, in 
    parse_requirements(__requires__), Environment()
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 598, in resolve
    raise VersionConflict(dist,req) # XXX put more info here
pkg_resources.VersionConflict: (psutil 0.6.1 (/usr/local/lib/python2.7/dist-packages/psutil-0.6.1-py2.7-linux-x86_64.egg), Requirement.parse('psutil==1.2.1'))
--- leap/client » dpkg -l|grep bitmask

ii  bitmask                                       0.3.8.4+0~20131216150423.72+saucy~1.gbp4425bc            all          Provides the desktop client for the LEAP Encryption Access Project Platform.

there's an update for the client package, but i cannot install it (i'm opening another bug for that).

(from redmine: created on 2013-12-23, closed on 2013-12-25, relates #4828 (closed))