xubuntu 12.04 and webmin

[Joep L. Blom]

HI,
I installed xubuntu as guest in vmware (works like a charm only don't 
use Easy Install) and it runs reasonably stable.
However, first I was annoyed by the ubuntu software center that shows me 
a list of advertisements which is IMO very much against Open Source 
etiquette. I became much more annoyed when I couldn't find my standard 
management tool Webmin in the repositories. I found a lot of useless and 
buggy applications and many superfluous or old.
Luckily Gkrellm ( one of my most valuable tools) is still in the 
repository and it is 2.3.5 which is reasonably recent.
So why is one of the best admin tools not in the repositories?
(Maybe Oliver Grawert knows the answer?)
Joep