Why do I get the error "AH00534: apache2: Configuration error: More than one MPM loaded." when I try to start Apache?

Question

Apache HTTP Server

I'm trying to raise a server on Ubuntu under Windows using Vagrant.
The process was slowly but surely moving forward, but after installing phpMyAdmin, Apache "died". When I try to run it, the following appears:

$ sudo /etc/init.d/apache2 start
* Starting web server apache2
*
* The apache2 configtest failed.
Output of config test was:
AH00534: apache2: Configuration error: More than one MPM loaded.
Action 'configtest' failed.
The Apache error log may have more information.

Googled that "$ apt-get install apache2-mpm-itk" might help, came up with the following message about dependencies:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
apache2-mpm-itk : Depends: apache2 (= 2.4.7-1ubuntu4.9) but 2.4.18-1+deb.sury.org~trusty +2 is to be installed
E: Unable to correct problems, you have held broken packages.

The commands "$ sudo aptitude purge apache2.2-common" and "$ sudo aptitude install apache2" did not fix the situation. What to do?? I put off a complete reinstallation until the last, because I suffered for a long time with the Apache settings ..

Answer 1

Things are changing so fast now that apache2-mpm-itk is installed as a module to Apache in Ubuntu 16.04. Check out this article here.