Comment 4 for bug 1286882

I just want to make this workaround clear.

The commenters having problems should make sure apache2 is running with mpm-prefork worker before trying to install mpm-itk. The workaround for my servers may or may not solve the problem for you. It's just four lines at the at root command prompt. Prefix each with sudo if you are not logged in as root:

# a2dismod mpm_event
# a2enmod mpm_prefork
# service apache2 restart
# apt-get install libapache2-mpm-itk