tarmac testing fails on trusty

Tarmac tests fail on a trusty target :(

How to reproduce:
(I tried this on a raring host with vbox 4.2 and vagrant 1.0.7, as well as a trusty host with vbox 4.3.2 and vagrant 1.4.3).

./test-in-vagrant.sh trusty

[trusty] Bringing VM 'up'
[trusty] Unable to 'up' VM!
[trusty] stdout: http://paste.ubuntu.com/6838582/
[trusty] stderr: http://paste.ubuntu.com/6838583/
[trusty] NOTE: unable to execute tests, marked as failed
[trusty] Destroying failed VM to reclaim resources
[trusty] Forcing shutdown of VM...
[trusty] Destroying VM and associated drives...

Here's the relevant portion of the log:
Installing pip-3.3 script to /usr/local/bin

Installed /usr/local/lib/python3.3/dist-packages/pip-1.3.1-py3.3.egg
Processing dependencies for pip==1.3.1
Finished processing dependencies for pip==1.3.1
I: using pip to install python packages
I: installing following pip packages: argcomplete==0.5.4 coverage==3.6 flake8==2.0 funcsigs==0.3 mccabe==0.2.1 pep8==1.4.5 pyflakes==0.7.2 python-distutils-extra==2.34 requests==1.1.0 sphinx-bootstrap-theme==0.2.3 urllib3==1.5
  Could not find any downloads that satisfy the requirement distribute (from argcomplete==0.5.4)
No distributions at all found for distribute (from argcomplete==0.5.4)
Storing complete log in /root/.pip/pip.log