I have a great USB rocket launcher. it’s more useful than a computer mouse most of the time. I spotted a moth on the roof the other day, and hadn’t installed pyrocket on this computer yet.

A quick apt-get install pyrocket is all it takes to solve that though, right? No such luck.

This package has been broken for several months now in the Ubuntu repos, though the dependency issue is fixed in a fork of the upstream.

So this is the error you get at the moment:

Traceback (most recent call last):
  File "/usr/bin/pyrocket", line 17, in <module>
    from rocket_frontend import RocketWindow
  File "/usr/lib/pymodules/python2.7/rocket_frontend.py", line 11, in &lt;module&gt;
    from rocket_webcam import VideoWindow
  File "/usr/lib/pymodules/python2.7/rocket_webcam.py", line 2, in &lt;module&gt;
    from opencv import cv, highgui
ImportError: No module named opencv

The solution, beyond complaining on the bug tracker, is to read the bug report here and do this:

git clone https://github.com/stadler/pyrocket
cd pyrocket/src
./pyrocket.py

But the moth had escaped by then.