I have debian Wheezy on an independent Dell amd64 how do I get to accept commands to install a virtual box?  here's what I put in terminal (also tried in root terminal):$ vi /etc/apt/sources.list.d/virtualbox.listit accepted this, but, then, I put in:$ deb http://download.virtualbox.org/virtualbox/debian wheezy contriband I got: E35 No previous regular expressionany help would be grateful.  
wheezy not accepting commands
debian;apt