
Since 1.9 release, midgard-data package provides "level 0" database.
It means YOU CAN NOT UPGRADE from releases < 1.8.

If you have Midgard 1.4, 1.5, 1.6 or 1.7 installed, you must first 
install midgard 1.8 ( at least midgard-core , midgard-php and midgard-data ).
Update database using datagard and install 1.9 release.
