Greating!

Afte installed 3.4, tried to "apt-get install xinetd" and got error message:

Reading Package Lists... Done
Building Dependency Tree... Done
Package xinetd 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 xinetd has no installation candidate

Any ideas?
Thanks advance!