Comment 5 for bug 1244824

The logs indicate that something has gone wrong with the upgrade. Please see if following commands fix the issue:
sudo apt-get -f install
sudo dpkg --configure -a

Also, a Facebook post[1] by Zend Technologies states following:
"If you want to use Zend Server on Ubuntu 13.10 - you need to use Nginx web server. Apache 2.4 is on roadmap but not yet supported."

[1] https://www.facebook.com/ZendTechnologies/posts/10151958383822140

That's pretty much all I can think of. I'm sorry I can't assist you any further.