apt-get install apache2-mpm-itk

a2enmod mpm_itk

# a2dismod mpm_prefork
# a2enmod mpm_itk

sudo apt-get install libapache2-mpm-itk

a2enmod mpm_itk

Setting up libapache2-mpm-itk (2.4.7-04-1) ...
apache2_invoke: Enable module mpm_itk
root@openstackm1:~# a2enmod mpm_itk
Considering dependency mpm_prefork for mpm_itk:
Considering conflict mpm_event for mpm_prefork:
Considering conflict mpm_worker for mpm_prefork:
Module mpm_prefork already enabled
Module mpm_itk already enabled
root@openstackm1:~#