Get the Ubuntu Core image from: http://cdimage.ubuntu.com/ubuntu-snappy/15.04/stable.
You want a file named like: ubuntu-15.04-snappy-armhf-raspi2.img.xz
You need to write that as an image into your SD card, so you need either a computer with an SD slot, or an external SD card reader. The Raspberry Pi homepage has very nice instructions on how to do it from several operating systems.
When done you can put that SD card into your Raspberry Pi 2 and power it on. Make sure to plug it also to an ethernet cable that’s connected to your router.
It will take a minute or two to boot. Once booted you’ll be able to login by connecting the raspi to a tv or monitor and a keyboard. Or, you can use ssh, but you’ll first need to know the IP address. To do that, try using the “webdm.local” address, like this:
alecu@bollo:~$ getent hosts webdm.local
192.168.1.131 webdm.localIf that doesn’t work, try installing the nmap package and searching your network for a host with ssh enabled:
alecu@bollo:~$ nmap -p22 192.168.1.0/24
Starting Nmap 6.47 ( http://nmap.org ) at 2015-11-13 20:00 ART
Nmap scan report for OpenWrt.lan (192.168.1.1)
Host is up (0.00050s latency).
PORT STATE SERVICE
22/tcp open ssh
Nmap scan report for 192.168.1.131
Host is up (0.00044s latency).
PORT STATE SERVICE
22/tcp open ssh
Nmap scan report for 192.168.1.154
Host is up (0.000090s latency).
PORT STATE SERVICE
22/tcp open ssh
Nmap done: 256 IP addresses (3 hosts up) scanned in 3.04 secondsOnce you’ve found the address, you can ssh into it, using “ubuntu” as both the username and password:
alecu@bollo:~$ ssh ubuntu@192.168.1.131
ubuntu@192.168.1.131's password: ******
Welcome to Ubuntu 15.04 (GNU/Linux 4.2.0-1014-raspi2 armv7l)
* Documentation: https://help.ubuntu.com/
Welcome to snappy Ubuntu Core, a transactionally updated Ubuntu.
* See https://ubuntu.com/snappy
It's a brave new world here in snappy Ubuntu Core! This machine
does not use apt-get or deb packages. Please see 'snappy --help'
for app installation and transactional updates.
Last login: Fri Nov 13 22:37:16 2015 from 192.168.1.154
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
(RaspberryPi2)ubuntu@localhost:~$This post is part 1 in a series of posts on how to get started writting IoT apps for the snappy Ubuntu Core.