Completely Re-install Apache2 on Ubuntu

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Find and drop all Apache packages:

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APACHE_PKGS=`sudo dpkg --get-selections | grep apache | cut -f 1`
# Make sure things are sane:
echo $APACHE_PKGS
# Example output: apache2 apache2-mpm-prefork apache2-utils apache2.2-common \
# libapache2-mod-php5 libapache2-mod-python libapache2-svn
# Likely if you have a Python application:
# libapache2-mod-python libapache2-mod-python-doc libapache2-mod-wsgi
# Or if you roll with the PHP: 
# libapache2-mod-php5
sudo apt-get remove --purge $APACHE_PKGS

Re-install Apache

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# You might want to consider not re-installing the whole list;
# instead dump it out, audit, and install what you need:
sudo apt-get install $APACHE_PKGS
After this, all the configuration files were back, and I had a default Apache install.

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