Ubuntu 17.10 require switch to tty7 while shudown/restart
there is something strange in Ubuntu 17.10. When I do shutdown (or reboot) the system hangs on black empty screen with cursor only. It is not tty1, nor tty7. The only way to let system shutdown is to switch on tty7 manually. After switching in 1-2 sec system continue shutdown itself normally. The question is how to avoid such behaviour.
I had similar symptoms. I could get a successful reboot only by removing quiet splash from the GRUB_CMDLINE_LINUX_DEFAULT= line in /etc/default/grub (and running sudo update-grub).
Not a real solution, but at least it avoids the hang.