Как я могу решить неудовлетворенные зависимости после добавления PPA для установки OpenStack?

При установке OpenStack я получил сообщение об ошибке, подобное следующему:

Some packages could not be installed. This may mean that you have 
requested an impossible situation or if you have 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: 
Openstack : Depends: conjure-up but it into going to 've installed
E: Unable to correct problems, you have held broken packages.

Как это можно решить, пожалуйста?