Errors were encountered while processing:
 apache2
 apache2-mpm-prefork
 libapache2-mod-php5
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up apache2 (2.4.7-1ubuntu4.1) ...
ERROR: Module mpm_prefork is enabled - cannot proceed due to conflicts. It needs to be disabled first!
dpkg: error processing package apache2 (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of libapache2-mod-php5:
 libapache2-mod-php5 depends on apache2 (>= 2.4); however:
  Package apache2 is not configured yet.

dpkg: error processing package libapache2-mod-php5 (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of apache2-mpm-prefork:
 apache2-mpm-prefork depends on apache2 (= 2.4.7-1ubuntu4.1); however:
  Package apache2 is not configured yet.

dpkg: error processing package apache2-mpm-prefork (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 apache2
 libapache2-mod-php5
 apache2-mpm-prefork