Local unrar

Thank you Zappes,

Initially I did try this, and on attempting "apt-get install unrar", I received the following;

You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
unrar: Depends: libc6 (>= 2.3.5-1) but 2.3.2.ds1-22sarge6.infrant1 is to be installed
Depends: libgcc1 (>= 1:4.1.1-12) but 1:3.4.3-13 is to be installed
Depends: libstdc++6 (>= 4.1.1-12) but it is not installable
W: Couldn't stat source package list http://packages.debian.org readynas/ Packages (/var/lib/apt/lists/packages.debian.org_stable_utils_readynas_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

I'm not confident enough to simply try the apt-get update and don't know much about all the C type stuff above.

The First two packages appear to be installed (see below), however the libstdc++6 is not.
readynas:/# dpkg -s libgcc1
Package: libgcc1
Status: install ok installed
Priority: required
Section: libs
Installed-Size: 152
Maintainer: Debian GCC maintainers <debian-gcc@lists.debian.org>
Source: gcc-3.4 (3.4.3-13)
Version: 1:3.4.3-13
Depends: libc6 (>= 2.3.2.ds1-21)
Description: GCC support library
Shared version of the support library, a library of internal subroutines
that GCC uses to overcome shortcomings of particular machines, or
special needs for some languages.

readynas:/# dpkg -s libstdc++6
Package `libstdc++6' is not installed and no info is available.

Any assistance in where to go from here will be appreciated. Thanks in advance.