in section 6.3.8.2. Using the Shell and Viewing the Logs there is this text in most systems, and if you are not installing over serial console, the easiest method is to switch to the second virtual console by pressing Left Alt-F2[18] (on a Mac keyboard, Option-F2). Use Left Alt-F1 to switch back to installer itself. but if using gui then Alt-F5 is needed to return