I'm running Scribus 1.4.5 on Ubuntu Studio 15.04.
Back in the 14.04 version everything was fine, but now, if I use Scribus, that's the interface I get:
That early 90's look is greatly different from the cool interface that I see, for example, here
(I'm now noticing that that screenshot also comes from a quite old Scribus version, 1.3!).
I know that I had this problem also in Scribus 1.4.4, because yesterday I updated it also because I wanted to check if the new version had the same problem.
I suppose I just lack a library or something like that.
Also, I don't know if this is normal, but when I start it I get this b/w banner: I'm sure it was colored, back in Ubuntu 14.04.