How-To: Install Ubuntu Linux With No Optical Drive

“It’s actually pretty easy. But before I tell you how
there’s a small list of things you need to do first:

“1. You need a USB stick that you don’t mind erasing all
the data off of so you can put a distro of *nix on it.
2. The computer you do this on must be physically connected to the
router, i.e. no wireless here. Must be wired. Granted, some *nix
distros come with decent wireless support, but better safe than
sorry here. Configure the wireless later.”

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