How to check what version of a package is available in the current ubuntu?

Fri Feb 12 16:52:48 UTC 2010

My bash is of the following version. I'm wondering if I want to update
bash what version I will get.

$ bash --version
GNU bash, version 3.2.39(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2007 Free Software Foundation, Inc.

I searched on the ubuntu website. There are too many related packages.
Could somebody let me know which one will be used when bash is
updated?

http://packages.ubuntu.com/search?keywords=bash&searchon=names&suite=karmic&section=all