On general meta there are many such discussions, and they are better suited there, imho, because the badges-system is common for all sites, afaik, and not related to ubuntu especially. And SO-meta is to my knowledge the right place for those common questions (but moderators don't seem to care much about it, leading to duplicated discussions in all meta places).
###Moderators! Are you trying to collect many questions in meta?
If you follow the linked discussion, you will find that it is a common sport to upvote unupvoted questions, when somebody is complaining about not getting the badge. ;) So I will look now what I can do for you.
