It looks like it's working now in trusty:
root@trusty-apache-itk:~# a2enmod mpm_prefork
Considering conflict mpm_event for mpm_prefork:
Considering conflict mpm_worker for mpm_prefork:
Module mpm_prefork already enabled
root@trusty-apache-itk:~# a2enmod mpm_itk
Considering dependency mpm_prefork f
Cant set up cups cos of this error; please fix
The following packages were automatically installed and are no longer required:
foomatic-db-gutenprint ijsgutenprint libapreq2-3 libjbig-dev libjpeg-dev
libjpeg-turbo8-dev libjpeg8-dev liblzma-dev libpng12-dev libtiff5-dev
libtiffxx5
Use 'apt-ge
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: apache2 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/13