Upgrade Indico from 1.2

The migration tool (indico-migrate) requires Python 2.7 and Indico 2.0. It is not supported by Indico v3 nor will it work on Python 3.

If you still need to migrate a legacy instance from the 1.x (or older), please consult the documentation from Indico v2. You may also want to consider running the migration on a separate virtual machine in order to not clutter the server that will run Indico v3 with legacy tools and software.