vokoscreen prob.

root@debian:~# sudo apt-get install vokoscreen
Reading package lists... Done
Building dependency tree
Reading state information... Done
W: Duplicate sources.list entry http://http.debian.net/debian/ wheezy-updates/main amd64 Packages (/var/lib/apt/lists/http.debian.net_debian_dists_wheezy-updates_main_binary-amd64_Packages)
W: You may want to run apt-get update to correct these problems
E: Unable to locate package vokoscreen

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the above output result of the command : sudo apt-get install vokoscreen

thanks & cya then