The application alien is a CLI command that allows you to install an RPM package on a Debian system or just convert it into a deb file.
Install alien and fakeroot from the repos.
Single Step rpm install
To install an rpm package, open a console in the same directory where the package is and type :
fakeroot alien -i packagename.rpm
Multi-Step rpm install
To convert an rpm package to a deb package, open a terminal and type:
fakeroot alien -d packagename.rpm
and then install the .deb file produced by clicking on it.
Tips and tricks
For details, consult the man file (in a terminal: man alien).