kdmtheme installieren

Hallo leider lässt sich kdmtheme bei mir nicht installieren:

sudo apt-get install kdmtheme 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package kdmtheme is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package kdmtheme has no installation candidate

Fehlt mir eine Quelle und wenn ja welche?