I'm running Debian Jessie 8.2 from a live boot, from a USB stick.  It works; I can boot and use it normally, but I can't connect to WiFi.I've read that I probably need non-free drivers, (but right now i just want it to work, and it doesn't matter if the drivers are non-free). I've been using this tutorial, which I've been following pretty well.My network controller is Broadcom Corporation bcm4313 802.11bgm wireless network adapter.The first weird thing was that the sources.list file that was mentioned didn't have the line exactly as in the article -- the difference was that it said http instead of ftp.us -- all the rest of that line was the same.  Would the fact that I'm in Argentina be a reason for this?  I saved the changes, and then as said in the article, ran apt-get update in the terminal.Question:  Why is there a # before the instruction in the tutorial?The terminal responded with output saying failed to fetch and could not resolve.Also, how do I copy text from Debian? By the way, to understand this process better, we aren't trying to download things, right?  Because that's my problem: Debian has no Internet connection.
Making wifi work
debian;wifi;live usb
You will need a hardwired Ethernet connection to run most apt-get commands (in your case), because yes, apt-get update is trying to download an updated package listing from a remote repository over the Internet.Installing drivers in Linux can be tricky if you are new to this, but you have all of the basic info -- you know the network card that you need the drivers for.  From that point, it's a simple matter of following your tutorial or Googling a bit more after you have established an Internet connection via Ethernet.If you have no Ethernet port, then you will need to download the drivers elsewhere and copy them to a USB stick and then copy them to your Debian filesystem and install them from there.