Why does the "blender-tpaw" package exist?
As you maybe know, Ubuntu recently introduced a package format called Snaps, in addition to the familiar Deb format. "tpaw" is the nickname or handle of Thomas CaseyWilcox, who created a snap package of Blender. So basically, "blender-tpaw" is Blender in another wrapping.
For no good reason. It is still there in 2020, not even up to date with the latest Blender version, when there is an official snap from the Blender Foundation. It should be deleted to avoid confusion.