LTS

14.04.3 Early Release

It is possible to install the preview version of 14.04.3 in your system, even before it is GA. You can do that to start playing with a more recent kernel, 3.19 in this case.

In order to do so, you can just install the following packages in your current 14.04.2 installation:

    # apt-get update
    # apt-get install linux-image-3.19.0-18-generic linux-image-extra-3.19.0-18-generic
    # reboot

After that, you should have 3.19 kernel installed, as shown:

    $ uname -r
    3.19.0-18-generic

Standard Release

Early 15.10

Wily Werewolf (15.10) release started to ship daily images.

http://cdimage.ubuntu.com/ubuntu-server/daily/current/wily-server-ppc64el.iso