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The Linux Mint team recommends upgrading versions using a LiveCD and doing a fresh install.  This method has its benefits but, for many users and environments, using the package repository online method is far superior.  First we need to make sure that we are running as root to make the process simple:

sudo -i su

Using the following command you will have your system package configuration files automatically modified for the update (I have included the old and new versions at the end of this tutorial for reference; there is no need to modify them by hand.)

sed -i 's/maya/nadia/g' /etc/apt/sources.list
sed -i 's/precise/quantal/g' /etc/apt/sources.list

Once we have changed the sources.list file, we are ready to do the update.  As always be sure that everything that you want to keep is backed up!  Upgrades are never completely safe.  Protect yourself. Once you are ready:

apt-get update; apt-get dist-upgrade
apt-get upgrade
reboot

Once your system reboots you should have a fully functional Linux Mint 14 installation.  On mine I found only one issue and that was that, for some reason, DNS was not updating correctly so I had to run the following command (thanks to everyone who commented.)  After doing that, everything worked properly.

dns-fix

As promised, here are the before and after /etc/apt/sources.list files.

deb http://packages.linuxmint.com/ maya main upstream import
deb http://archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ precise partner
deb http://packages.medibuntu.org/ precise free non-free
#deb http://archive.getdeb.net/ubuntu precise-getdeb apps
#deb http://archive.getdeb.net/ubuntu precise-getdeb games

deb http://packages.linuxmint.com/ nadia main upstream import
deb http://archive.ubuntu.com/ubuntu/ quantal main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ quantal-updates main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ quantal-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ quantal partner
deb http://packages.medibuntu.org/ quantal free non-free
#deb http://archive.getdeb.net/ubuntu quantal-getdeb apps
#deb http://archive.getdeb.net/ubuntu quantal-getdeb games

Elastix is possibly the most powerful packaging of the Asterisk server.  Elastix comes as its own distribution built on top of CentOS and for most users going with the Elastix-provided install media is the best process.  However, if you wish to install the Elastix packages onto your own install of CentOS, like for times when you need to install to a Xen-based virtual server, then you need to use a different process.

Elastix provides its packages through a standard YUM repository system making it very easy to work with.  Using these repos is barely documented, if at all, and not all dependencies are addressed through these repos.  Additionally, with the introduction of Elastix 2.x, some of the necessary packages are handled by the Elastix 1.x branch while others are handled by the 2.x branch making the process a little more confusing.

To begin, we need a base installation of the CentOS 5 series.  Start with any CentOS 5 minimal install and updated it to the latest patches.

yum -y update

Then we will need to install the EPEL extensions from the Fedora Project.

rpm -ivh ftp://mirror.cs.princeton.edu/pub/mirrors/fedora-epel/5/i386/epel-release-5-4.noarch.rpm

Now let’s add some useful packages that we are sure to want.

yum -y install sysstat fail2ban bwm-ng system-config-securitylevel-tui

To install Elastix itself we need to upload the CD ISO image that we have downloaded from the Elastix website. To make things simple, simply upload it to the /tmp directory of our new server. Once we have the file there, we need to mount it so that we can use it like a local filesystem.

mkdir /mnt/iso
mount -o loop /tmp/Elastix-2.3.0-x86_64-bin-02abr2012.iso /mnt/iso
cd /mnt/iso

In order to utilize the new Elastix repo that we have just mounted we need to create a YUM repo entry for this.

vi /etc/yum.repos.d/elastix-cd.repo

[elastix-cd]
name=Elastix RPM Repo CD
baseurl=file:///mnt/iso/
gpgcheck=0
enabled=1

And at this point we should be ready to actually install Elastix which is about 266 packages.

yum -y install elastix

Once that completes we will want to reboot. You will want to be connected to the server via the console, not via SSH, as Elastic’s First Boot system will come up and step you through the basic setup of the system which just requires you to set two key passwords. If you are not at the console you will never see this dialog and you will be unaware that the application needs your attention.

Once the system comes back up, we should remove some unneeded services. No need to have extra stuff running. It is unlikely that we will be using iSCSI or NFS on our PBX so we will turn those services off.

chkconfig iscsi off
chkconfig iscsid off
chkconfig netfs off