1. Change gnome-cards-data to 'Recommend' as opposed to 'Suggest' dependency. This would be easiest, but some folks may not like it if it adds size to the installer. (Is aisleriot part of the installer?)
2. Add "Is gnome-cards-data package installed?" to the error message so it's not as vague.
A couple possible solutions I see -
1. Change gnome-cards-data to 'Recommend' as opposed to 'Suggest' dependency. This would be easiest, but some folks may not like it if it adds size to the installer. (Is aisleriot part of the installer?)
2. Add "Is gnome-cards-data package installed?" to the error message so it's not as vague.