Ajenti will not run on Ubuntu Server 14.10 without some tweaks.
Some packages are missing that would prevent you from getting to Ajenti via https://localhost:8000/
So , here is how to install Ajenti on Ubuntu Server 14.10!
Quick automatic install
wget -O- https://raw.github.com/Eugeny/ajenti/master/scripts/install-ubuntu.sh | sudo sh
sudo apt-get install python-dev
sudo apt-get install python-setuptools
sudo easy_install -U gevent