First make sure your /etc/apt/sources.list contains the  wheezy-updates repository (this makes sure you always get the newest updates for the ClamAV virus scanner – this project publishes releases very often, and sometimes old versions stop working), and that the contrib and non-free repositories are enabled (some packages such as libapache2-mod-fastcgi are not in the main repository).

To edit them run the command

nano /etc/apt/sources.list

If you also want the contrib and non-free components, add contrib non-free after main. like below

deb wheezy main contrib non-free
deb-src wheezy main contrib non-free

deb wheezy/updates main contrib non-free
deb-src wheezy/updates main contrib non-free

# wheezy-updates, previously known as 'volatile'
deb wheezy-updates main contrib non-free
deb-src wheezy-updates main contrib non-free
Update Debian Source List Installation

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