Comment 7 for bug 1448521

I have this PPA in sources.list:
deb http://ppa.launchpad.net/unity8-desktop-session-team/unity8-preview-lxc/ubuntu vivid main

and I reveive messages:
corrado@corrado-HP-620-u8:~$ sudo unity8-lxc-setup
usage: unity8-lxc-setup [-h] [--rebuild-all] [--rebuild-config]
                        [--rebuild-rootfs] [--redownload] [--test SECONDS]
                        [--destroy] [--update-lxc]
unity8-lxc-setup: error: The container already exists.
corrado@corrado-HP-620-u8:~$ sudo unity8-lxc-setup --update-lxc
Starting the container
usage: unity8-lxc-setup [-h] [--rebuild-all] [--rebuild-config]
                        [--rebuild-rootfs] [--redownload] [--test SECONDS]
                        [--destroy] [--update-lxc]
unity8-lxc-setup: error: Unable to start the container.

should I change PPA?
Thanks