Tried installing it from command line (sudo apt-get install gwget)

and I get this:

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Package gwget 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



E: Package 'gwget' has no installation candidate

what does it mean?

I'm using Ubuntu 13.10