I'm trying out VirtualBox 4.18 and wanted to install Ubuntu 12 as a test. After installing VirtualBox (on Debian squeeze/sid), creating a virtual machine for Ubuntu and pointing it in Settings > Storage > IDE Controllers to the ISO with the proper version of Ubuntu, checked the "Live CD" option. Tried to define the IDE as master / slave, primary / secondary - all to no effect, and trying to boot this system, I'm getting to the screen which says:
FATAL: could not read from the boot medium! System halted
I've copied the same ISO to the USB stick, and I can boot from the USB (outside VirtualBox).
I've looked at couple of tutorials / walk-through, there's nothing I can see that I would've done wrong.
So, how would I configure it to boot from the desired ISO?
Below is the snapshot with the current settings (sorry, I don't know how to get them as text).