sudo apt-get install electricsheep
[sudo] password for zeref:
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:
  electricsheep: Depends: mplayer but it is not going to be installed
E: Broken packages
zeref@anima:~$ sudo apt-get install mplayer
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:
  mplayer: Depends: libavformat52 (>= 4:0.5.1-1) but it is not going to be installed or
                    libavformat-extra-52 (>= 4:0.5.1-1) but it is not going to be installed
E: Broken packages