When installing the "Ubuntu 12.04 / 64-bit" package, I get the following ominious warning from the Ubuntu Software Center...

The package is of bad quality

The installation of a package which violates the quality standards isn't allowed. This could cause serious problems on your computer. Please contact the person or organisation who provided this package file and include the details beneath.

Details
The package doesn't provide a valid Installed-Size control field. See Debian Policy 5.6.20.

Ugh, what a horrible warning message.

We will have to add this field to the next build of our DEB packages. I don't know why 'dpkg --build' can't just figure it out automatically, like RPM does.

Today we have released Prince 8.1 rev 3, which sparkling fresh DEB packages that should not produce any ominous warnings on Ubuntu 12.04. Thanks for letting us know about the issue!