error install percona-xtradb-cluster-server-5.6

apt-get install percona-xtradb-cluster-56
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
percona-xtradb-cluster-56 : Depends: percona-xtradb-cluster-server-5.6 (>= 5.6.15-25.5-759.raring) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.5 LTS
Release: 12.04
Codename: precise

cat /etc/apt/sources.list
deb http://archive.ubuntu.com/ubuntu precise main restricted universe
deb http://archive.ubuntu.com/ubuntu precise-updates main restricted universe
deb http://security.ubuntu.com/ubuntu precise-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu precise partner

##################
######### Percona
deb http://repo.percona.com/apt raring main
deb-src http://repo.percona.com/apt raring main

precise main
deb-src http://repo.percona.com/apt precise main



Run apt-get autoclean, apt-get update

Then try to install again: [URL="https://www.percona.com/doc/percona-xtradb-cluster/5.6/installation/apt_repo.html#install-percona-xtradb-cluster"]https://www.percona.com/doc/percona-...xtradb-cluster[/URL]