$ sudo su -s /bin/sh aegir -c "sh install.sh"
==> Drush found in /var/aegir/drush/drush.php, good
==> Drush seems to be functioning properly
==> Provision already seems to be installed
==> Installing the frontend
Aegir 6.x-1.0-rc2 automated install script
==============================================================================
Some settings have not been provided and will now be prompted.
Don't worry: you will get to review those settings after the final install
Aegir frontend URL :
MySQL privileged user ("root") password:
Admin user e-mail :

This script will operate the following changes in your system:

1. Create server-level configuration directories
2. Download drush_make
3. Create the Hostmaster frontend platform
4. Install the frontend site
5. Setup the dispatcher (a user cron job)

We are making the following assumptions:
 * you have read INSTALL.txt and prepared the platform accordingly
 * the FQDN of this machine is valid and resolves
 * you are executing this script as your "aegir" user

The following settings will be used:
 Aegir frontend URL:
 Master server FQDN:
 Aegir root: /var/aegir
 Aegir user: aegir
 Web group: www-data
 Web server: apache
 Aegir DB host: localhost
 Aegir DB user: root
 Aegir DB password: <prompted>
 Drush make version: 6.x-2.1
 Aegir version: 6.x-1.0-rc2
 Aegir platform path: /var/aegir/hostmaster-6.x-1.0-rc2
 Aegir makefile: /var/aegir/.drush/provision/aegir.make
 Client email: webmaster@cygnus.mustbuilddigital.net

Do you really want to proceed with the install (y/n): y
The external command could not be executed due to an application     [error]
error.
could not find driver                                                [error]
Drush command could not be completed.                                [error]
Output from failed command :                                         [error]

Fatal error: Call to a member function quote() on a non-object in
/var/aegir/.drush/provision/db/db.drush.inc on line 326

Output from failed command :                                         [error]

[sudo] password for aegir: