Ubuntu Touch is no longer maintained as a core product by Canonical. However, the Ubports community are continuing development.
Ubuntu Touch Core Apps Project:
A PPA has been setup which contains all of the Core Apps, and their dependencies (where not satisfied elsewhere). Core Apps are built and published regularly by Canonical infrastructure into this PPA. Add it to a computer running Ubuntu 14.04 or later, or a mobile device running Ubuntu Touch to install and test out the applications therein:-
See also Collection PPA