Treat the initial requires as data about Ubuntu's versions
Fix prettytable
Add actual requires
Update requires

Change-Id: If6b441dfac6680eab3d692d56d3025cc8b6e7f23
Add some notes on current issues

... along with some commentary on why they are issues.

Change-Id: I37a953a05f6cb1ebcb39d41112a13993f2b8c6a0