(This tutorial assumes that you have ubuntu for Raspberry Pi, correctly, on an SDCARD. If not, see <this tutorial>)
Logging in blind is an easy task. Type ‘pi’ and hit enter. Then type ‘raspberry’ and hit enter. Now switch to root as some of the later commands will require it.
First you need to update your package list.
sudo apt-get update
Next you need to get the openssh-server. Type the below command, wait a couple seconds, then type y + enter. Now wait a minute or so while the package downloads and installs.
sudo apt-get install openssh-server
Remember, you want to connect to your Raspberry Pi but you don’t have a display so you can’t get the ip address of the device. The solution is to use the OK status LED to blink your IP address. We now need to get the code that will blink the ip onto the device and run it.
wget http://bit.ly/N6aQj4 -O blink_ip.pl
(The above url is a snapshot of the gist url https://gist.github.com/2858824)
After running the perl script the blinking of your ip address will commence. The blinking algorithm that conveys the IP address is relatively straight forward. If you need more details on the blinking algorithm please see http://chrismeyers.org/category/raspberry-pi/