Some people mail me about config bluetooth devices on Linux. I leave here a few simple steps to those who do not give the way to do it.
Obviously, you'll need to do all of the following with a wired USB keyboard.
Before pairing your keyboard, you'll need to install some software to get everything working. Open up a terminal, and type the following:
sudo apt-get update && sudo apt-get upgrade sudo apt-get install bluetooth bluez-utils blueman
It's probably sensible to reboot now and then plug in your Bluetooth dongle.
Now, you'll need to find the MAC address of your keyboard. Make sure that it's switched on and then put it into pairing mode by pressing the pairing button on the bottom of the keyboard. In the terminal, type the following:
hcitool scan You should see something like: 11:22:33:44:55:66 Bluetooth keyboard
Copy that MAC address (the 11:22:33:44:55:66 bit), as you'll need it for the next part. Now type (remembering to change the MAC address):
bluez-simple-agent hci0 11:22:33:44:55:66
It'll then ask you for a PIN code. Just enter something like 0000, first in the terminal and then on the keyboard itself. You'll need to add the keyboard as a trusted device by typing the following (again, with your own MAC address):
bluez-test-device trusted 11:22:33:44:55:66 yes Finally, connect the keyboard by typing: bluez-test-input connect 11:22:33:44:55:66
Remember you have PiKISS with an automated script to achieve it with no effort