Scribus installation guide for Ubuntu says that «the packages from the Debian and Ubuntu repositories are the standard way to obtain Scribus» and the download page says that the current stable version is 1.4.8.
However, sudo apt-get install scribus
installs version 1.5.6 (development), that is «for testing purposes only» (as advised in the splash screen) and indeed when I open it I can't even activate any button or menu item, so I want to install the stable version. How can I do that?