korn 93 for ubuntu edgy

[reader at newsguy.com]

"Ralph Thaller" <ralph.thaller at gmail.com> writes:

> you can search for packages with apt-cache search foobar.
>

Thanks Ralph... 
If it turns up no hits on korn then does it mean no Korn shell package
is available? Not from contributors or the like at least.

That is, is running `apt-cache search pkg' really an exhaustive search?
Do I need special listings in sources.list to find something like a
user contributed package?

Do you know specifically if there is a ksh-93 package available?