There shouldn't be any search on the item being presented, but I think being able to do another search without an unnecessary extra click would make the experience a lot more enjoyable. Users are becoming more used to using web browsers where the search bar is ever present!
The full screen mockup (linked from the spec) displays a search bar: https:/ /wiki.ubuntu. com/SoftwareCen ter?action= AttachFile& do=view& target= softwareCentre_ Item.png
There shouldn't be any search on the item being presented, but I think being able to do another search without an unnecessary extra click would make the experience a lot more enjoyable. Users are becoming more used to using web browsers where the search bar is ever present!