Comment 0 for bug 1416885

the postinst for apache2 2.4.7-1ubuntu4.1 copies an index.html into /var/www/html if it cannot find one in */var/www*
I upgraded a server from lucid->precise->trusty today, and the top page was broken at the end due to this (my site was already in /var/www/html)

install_default_files()
{
        if is_fresh_install $@ || we_are_upgrading_from_wheezy $@ ; then
                if [ ! -e /var/www/index.html -a \
                        ! -h /var/www/index.html -a \
                        ! -e /var/www/index.cgi -a \
                        ! -e /var/www/index.pl -a \
                        ! -e /var/www/index.php -a \
                        ! -e /var/www/index.xhtml -a \
                        ! -e /var/www/index.htm ] ; then
                                cp /usr/share/apache2/default-site/index.html /var/www/html/index.html
                fi
        fi
}