Hi guys, I've just installed Kali and I can't install anything using the terminal. Before I used Ubuntu and I could've installed almost anything I needed using the command apt-get install. Now each time I type it I get a message like this:

Code:
apt-get install pidgin
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package pidgin 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 'pidgin' has no installation candidate
Could you please give me a hint on how to solve this problem? Thanks a lot in advance!