Tails Installer is not available for the latest stable Ubuntu
Originally created by @goupille on #16086 (Redmine)
a user reported that it is not possible to follow our documentation to install Tails installer on Ubuntu 18.10 Cosmic Cuttlefish (released two weeks ago), as there are no directory for that release on http://ppa.launchpad.net/tails-team/tails-installer/ubuntu/dists/.
“someone” suggested that it might be a good idea to schedule a recurring task for that since Ubuntu releases are predictible…