libreadline5 problem

[skybad]

/home/mta# apt-get install libreadline5

Reading package lists... Done

Building dependency tree... Done

Package libreadline5 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

However the following packages replace it:

readline-common

E: Package 'libreadline5' has no installation candidate

System Is Debian 6 32Bits can someone help me