ubuntu@juju-28aae9-0:~$ sudo apt-cache madison zookeeper
 zookeeper |    3.4.8-1 | http://archive.ubuntu.com/ubuntu xenial/universe amd64
 Packages                                                                      
 zookeeper |    3.4.6-1 | http://bigtop-repos.s3.amazonaws.com/releases/1.1.0/ub
untu/trusty/x86_64 bigtop/contrib amd64 Packages                               
 zookeeper |    3.4.8-1 | http://archive.ubuntu.com/ubuntu xenial/universe Sourc
es