Just moved away from Windows 8 to Ubuntu 16.0.4 LTS
Some fonts to install.
Very good is, that Scibus stores all pathways to pictures relative.
../../../Books/Calculation - ERROR 2011/Cover.png
So as long as all folders are in the same structure,
it works fine.
My only mistake was, that I named on the backup media the folder "books" instead of "Books".
After checking *.sla files for the reason, why much pictures not found,
the problem was solved by renaming books to Books.
Since some weeks, Scribus is direct available in the Ubuntu software center.