How to install lxc 4.0?

Hi! I just don’t know how to install it on Ubuntu 18.04.

apt-cache policy lxc
  Installed: 3.0.3-0ubuntu1~18.04.1
  Candidate: 3.0.3-0ubuntu1~18.04.1
  Version table:
 *** 3.0.3-0ubuntu1~18.04.1 100
        100 /var/lib/dpkg/status

I’ve found this

but adding repo returned that:

sudo add-apt-repository ppa:ubuntu-lxc/lxc-git-stable-4.0
Err:38 bionic Release                                     
  404  Not Found [IP: 2001:67c:1560:8008::15 80]

is there another way to install?

You’re linking to lxc-git-master but your error is for lxc-git-stable-4.0.