Computers have hostnames so that they can be addressed by a human readable name as well as by their IP address. The default hostname for your pcDuino is ubuntu.
You might want to change it if you have more than one pcDuino, or just to make your pcDuino your own. Changing the hostname is very easy. You just need to open two files, /etc/hosts and /etc/hostname, and replace the word ubuntu with your chosen hostname. These files are owned by root, so you need to open them as root. I changed my ubuntu’s hostname to pcDuino.
The contents of /etc/hostname is simply
$ nano /etc/hosts // change ubuntu to pcDuino
/etc/hosts should look like this:
$ nano /etc/hostname // change ubuntu to pcDuino 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 127.0.1.1 ubuntu
Reboot your pcDuino using this command:
$ sudo reboot
When you open a terminal, the prompt should look like this: