I'm showing the problem in images. What I want to access in 12.04(.1) (I'm using USB flash disk as the media, CD/DVD is OK):
How it should start:
How it starts now:
This something is shown in the bottom left side of the monitor.
There is no change if I press some keys, I can't access that menu. Just the ESC displays a dialog window, whithout any text, and two buttons. Non of them displays that menu.
If I press Shift, it asks two questions, but non of them shows that menu.
Used images: ubuntu-12.04.1-desktop-i386.iso and ubuntu-12.04.1-desktop-amd64.iso (torrent source) - used media: USB pendrive.
How can I access that menu?