It doesn't mean the Fn key (as found on a number of laptops), but an Fn function key, i.e. F1, F2, F3, F4, F5, F6, F7, or F8, and depending on your keyboard even possible is quite a number more of function keys lol.
ctrl+alt+f1 = go to vtty0 (system console)
ctl+alt+f2 = go to vtty1
ctl+alt+f3 = go to vtty2
and so on.
The X windows system runs on a vtty of it's own, so you get back to X with an ctl+alt+Fn key sequence; which one depends on how you've got X starting up. (Probably F8, F9, or F5)
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