ppa.launchpad.net is now reachable over IPv6.
There are still some other items on our to-do list, which are mostly less important:
* bazaar.launchpad.net * git.launchpad.net * lists.launchpad.net * keyserver.ubuntu.com
(On Ubuntu 18.04 and earlier, add-apt-repository relies on keyserver.ubuntu.com, so currently still requires IPv4. On Ubuntu 18.10 and later, add-apt-repository fetches keys from Launchpad instead, so will now work on IPv6-only systems.)
ppa.launchpad.net is now reachable over IPv6.
There are still some other items on our to-do list, which are mostly less important:
* bazaar. launchpad. net ubuntu. com
* git.launchpad.net
* lists.launchpad.net
* keyserver.
(On Ubuntu 18.04 and earlier, add-apt-repository relies on keyserver. ubuntu. com, so currently still requires IPv4. On Ubuntu 18.10 and later, add-apt-repository fetches keys from Launchpad instead, so will now work on IPv6-only systems.)