Comment 21 for bug 537011

Running /usr/bin/rss-glx_install or manually editing .xscreensaver did nothing for me. However, the correct desktop entries are in /usr/share/applnk/System/ScreenSavers/ (note the case of ScreenSavers) and copying the contents of that directory into /usr/share/kde4/services/ScreenSavers/ did the trick.

For complete clarity:

sudo cp /usr/share/applnk/System/ScreenSavers/*.desktop /usr/share/kde4/services/ScreenSavers/

is the command required. I'm on Kubuntu 10.04 and installed xscreensavers as well as rss-glx

Might I suggest that this is really a shortcoming in the setup of kde? Would it not be more helpful for /usr/share/kde4/services/ScreenSavers/ to symlink to /usr/share/applnk/System/ScreenSavers/ and have all of its standard contents in there? Using a system wide location is surely preferable?