The login depends on configuration, I got mine from Maplin (UK) and it is set to auto-login with the 'pi' account and launch the GUI by default, so I would assume that it has been configured like that by the retailer you've got it from (As I saw a lot of questions/articles/etc. about how could one login to the raspberry pi and similar)
One thing that comes in to my mind is reversing this it is for Raspbian, but I think it should work on other distros as well (although not tested)
If you specify the OS distro you are running, I will update with specific instructions
As to explain the process of the reversing the tutorial, just:
sudo nano /etc/inittab
#1:2345:respawn:/sbin/getty 115200 tty1
- Remove the hash
- If a line like:
1:2345:respawn:/bin/login -f pi tty1 </dev/tty1 >/dev/tty1 2>&1 is presented, I would recommend you to comment it out.
Based on your feedback in the comments, I googled a bit and found this method (as well I have not tested it):
- sudo nano /etc/lightdm/lightdm.conf
- Find the line
- Comment it out and then reboot or power off and on again(CAUTION Do not unplug and plug the RPi, you could damage it.)
This is the last thing I have found, let me know if it worked.