Comment 2 for bug 537011

Thanks for reporting this bug and any supporting documentation. Since this bug has enough information provided for a developer to begin work, I'm going to mark it as confirmed and let them handle it from here.

I did install the package 'rss-glx' to confirm this issue. I then restarted the computer to insure the changes would take effect. The following screensavers are not installed/listed in Applications -> Settings -> Screensaver :
Biof
Busy Spheres
Colorfire
Cyclone
Drempels
Euphoria
Feedback
Fieldlines
Flocks
Flux
Helios
Hufo's Smoke
Hufo's Tunnel
Hyperspace
Lattice
Lorenz Attractor
MatrixView
Plasma
Skyrocket
Solarwinds
SpirographX
Sundancer2

Thanks for taking the time to make Ubuntu better!