Invalid command line mode: toggle command line mode to black screen

The nano development board, when I used Ctrl+Alt+F3 to switch to the command line mode, displayed a black screen and was unable to use it. The system I re-burned is useless, is the nano development board does not support the command line mode?

Hi,

I can switch to the text mode. Do you use ctrl+alt+f3 when nano is under ubuntu desktop?