The Use and working of Beaglebone Black is very simple. You need only BBB and a USB cable (Supplied with BBB). In Ubuntu / Debian Linux you just download this file Download here and install it.
How to install downloaded file.
Open a terminal and type the following
$ chmod 755 mkudevrule.sh
This script will create a new file called 73-beaglebone.rules in /etc/udev/rules.d/
Now Plug your BBB to Ubuntu System through the USB Cable
Now BBB establish an adhoc Network Connection through USB
After a short time check the connectivity
The BBB will have an IP address, so using Chrome or Firefox (not Internet Explorer) connect to the URL http://192.168.7.2 (Chrome or chromium Browser)
Now You can see a web page served by BBB.
Now Open a terminal and type
$ ssh email@example.com
Now it will prompt a security warning type 'yes' or click on 'yes'
Now it will ask for PASSWORD. There is no password so press Enter