Comment 2 for bug 1331866

Verified with PXC 5.5 on Ubuntu.

nilnandan@nilnandan-Dell-XPS:~$ sudo apt-get install percona-xtradb-cluster-55
[sudo] password for nilnandan:
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-55 : Depends: percona-xtradb-cluster-galera-2 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
nilnandan@nilnandan-Dell-XPS:~$

nilnandan@nilnandan-Dell-XPS:~$ sudo apt-get install percona-xtradb-cluster-full-55
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-full-55 : Depends: percona-xtradb-cluster-galera-2 but it is not going to be installed
                                  Depends: percona-xtradb-cluster-5.5-dbg (>= 5.5.37-25.10-756.trusty) but it is not going to be installed
                                  Depends: percona-xtradb-cluster-galera2-dbg but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
nilnandan@nilnandan-Dell-XPS:~$

http://www.percona.com/doc/percona-xtradb-cluster/5.5/installation/apt_repo.html -- this document needs to be updated.
http://www.percona.com/doc/percona-xtradb-cluster/5.5/installation.html#deb-based-systems -- like this.