Comment 12 for bug 1191098

Make sure you have the python 3 version installed
sudo apt-get install python3-distutils-extra

Also, if you can, better build and install the debian packages. If you want/have to build from source, get it from our bazaar repository to catch all the latest fixes.

Install (most) build dependencies:
sudo apt-get build-dep onboard

If this fails on Zorin OS you'll have to install them manually. The required packages are listed in debian/control.

Then get the source, build packages and install them:
bzr branch lp:onboard
cd onboard
debuild binary
sudo dpkg -i ../onboard*.deb