To install on Ubuntu 14.04 LTS (Trusty Tahr), please add this repo and update. 64-bit only.

sudo apt-key adv --keyserver pgp.mit.edu --recv-keys F93418C56652E60C
sudo add-apt-repository 'deb [arch=amd64] http://dl.dnsdisco.com/ trusty main'
sudo apt-get update

To install on Ubuntu 16.04 LTS (Xenial Xerus), please add this repo and update. 64-bit only.

sudo apt-key adv --keyserver pgp.mit.edu --recv-keys F93418C56652E60C
sudo add-apt-repository 'deb [arch=amd64] http://dl.dnsdisco.com/ xenial main'
sudo apt-get update

The software can then be installed with the following commands:

sudo apt-get install discd
sudo apt-get install discli
sudo apt-get install discweb # (coming soon)