$ cat /etc/apt/sources.list.d/zentyal-2_3-precise.list
deb http://ppa.launchpad.net/zentyal/2.3/ubuntu precise main
deb-src http://ppa.launchpad.net/zentyal/2.3/ubuntu precise main
$ sudo apt-cache show zentyal-zarafa
Package: zentyal-zarafa
Priority: optional
Section: web
Installed-Size: 208
Maintainer: José Antonio Calvo <jacalvo@zentyal.org>
Architecture: all
Version: 2.3
Replaces: ebox-zarafa (<< 2.0.100)
Depends: zentyal-core (>= 2.3), zentyal-core (<< 2.3.100), zentyal-mail, zentyal-webserver, zarafa, zarafa-webaccess, zarafa-webapp, aspell
Filename: pool/main/z/zentyal-zarafa/zentyal-zarafa_2.3_all.deb
Size: 30812
MD5sum: 892b9cade75efcb899ab2a0602078d05
SHA1: 7e7b21a2f31b484ff55b3c8390117fcfd7be803c
Description: Zentyal - Groupware (Zarafa)
Zentyal is a Linux small business server that can act as
a Gateway, Unified Threat Manager, Office Server, Infrastructure
Manager, Unified Communications Server or a combination of them. One
single, easy-to-use platform to manage all your network services.
.
This module adds Zarafa integration with Zentyal.
$ sudo apt-get install zentyal-zarafa
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:
zentyal-zarafa : Depends: zarafa but it is not installable
Depends: zarafa-webaccess but it is not installable
Depends: zarafa-webapp but it is not installable
E: Unable to correct problems, you have held broken packages.