To install the GNU Taler Ubuntu packages, first ensure that you have
the right Ubuntu distribution. At this time, the packages are built for
Ubuntu 20.04 LTS (Focal Fossa).

A typical ``/etc/apt/sources.list`` file for this setup
would look like this:

.. code-block::

   deb http://ch.archive.ubuntu.com/ubuntu/ focal main restricted
   deb http://ch.archive.ubuntu.com/ubuntu/ focal-updates main restricted
   deb http://ch.archive.ubuntu.com/ubuntu/ focal-security main restricted
   deb http://ch.archive.ubuntu.com/ubuntu/ focal universe restricted
   deb http://ch.archive.ubuntu.com/ubuntu/ focal-updates universe restricted
   deb http://ch.archive.ubuntu.com/ubuntu/ focal-security universe restricted
   deb http://ch.archive.ubuntu.com/ubuntu/ focal multiverse restricted
   deb http://ch.archive.ubuntu.com/ubuntu/ focal-updates multiverse restricted
   deb http://ch.archive.ubuntu.com/ubuntu/ focal-security multiverse restricted

   deb https://deb.taler.net/apt/ubuntu/ focal-fossa main

The last line is crucial, as it adds the GNU Taler packages.

Next, you must import the Taler Systems SA public package signing key
into your keyring and update the package lists:

.. code-block:: console

   # wget -O - https://taler.net/static/taler-systems.gpg.key | apt-sign add -
   # apt update

.. note::

   You may want to verify the correctness of the Taler Systems key out-of-band.

Now your system is ready to install the official GNU Taler binary packages
using apt.