I've had a bit of trouble getting electric sheep 2.7 working on Kubuntu 9.04 and 9.10 (alpha) using the precompiled ppa packages.

I got it working in the end using the following modified .desktop file which should be placed at /usr/share/kde4/services/ScreenSavers/electricsheep.desktop

Would be great if this could be incorporated into the next build of the packages.  Cheers.

[Desktop Entry]
Encoding=UTF-8
Exec=electricsheep
Icon=kscreensaver
Type=Service
X-KDE-ServiceTypes=ScreenSaver
Actions=InWindow;Root;Setup;
X-KDE-Category=Fractals
Name=ElectricSheep

[Desktop Action Setup]
Exec=electricsheep-preferences
Name=Setup...

[Desktop Action InWindow]
Exec=electricsheep -window-id %w
Name=Display in specified window
NoDisplay=true

[Desktop Action Root]
Exec=electricsheep -window-id %w
Name=Display in root window
NoDisplay=true