If you are not seeing your tty's but only a frozen screen you could try this 
solution. It worked for me:
https://askubuntu.com/questions/162535/why-does-switching-to-the-tty-give-me-a-blank-screen

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https://bugs.launchpad.net/bugs/1725954

Title:
  It is hard and nonintuitive to switch to console ttys on Ubuntu 17.10

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