I am receiving the following message while I am trying to install Skype:

nidhin@ubuntu:~$ sudo apt-get update
nidhin@ubuntu:~$ sudo apt-get install skype
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 skype : Depends: skype-bin but it is not installable
E: Unable to correct problems, you have held broken packages

How can I fix this?