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I know that the Ctrl+Alt+F* shortcuts go to virtual terminals. This worked fine up through 11.10. But in 12.04, all I get is a blank screen when using a Ctrl+Alt+F* shortcut; I can still go back to my X session, though, by pressing Ctrl+Alt+F7. What is malfunctioning?

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These work for me in 12.04, so it sounds like you might be experiencing a bug. Do you notice anything interesting in your logs when you attempt to load one of these sessions? –  adempewolff Jun 7 '12 at 4:49
    
When you get the blank screen, press any key...something happen? –  izx Jun 7 '12 at 4:51
    
@izx Nothing appears to happen when I press keys in the blank screen. –  Gregory Gauthier Jun 7 '12 at 4:52
    
@adempewolff Which logs should I be checking? –  Gregory Gauthier Jun 7 '12 at 4:53
    
in /etc/default/grub, add option text to the GRUB_CMDLINE_LINUX_DEFAULT and run sudo update-grub and reboot. This should boot you into a console - tty1. Can you switch between terminals from there? If yes, run startx from tty1 to enter the desktop environment, and from there, see if the shortcut keys work. –  izx Jun 7 '12 at 4:56

1 Answer 1

I meet the same problem after update from 10.04 to 12.04. It is the problem of your video card driver. In my situation, after the update, the driver has been disabled and replaced by sth different. Go to the 'system setting', find the 'additional drivers', check if the correct video card driver is activated.

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