Ubuntu has seven tty,tty1-6 full-screen command lines and tty7 is a graphical interface. Normally, the system gives priority to starting the tty7 graphical interface by default.
Note whether there is a "Fn" key on the keyboard
Graphical interface:
ctrl + alt + f7
Or
ctrl + Fn + alt + f7
ctrl + alt + f1
Or
ctrl + Fn + alt + f1
F1 ~ f7 is similar, Ctrl + Fn + Alt + F1~F7 The essence is to switch between 7 windows, and the last window 7 is the graphical interface.
Kill the tty process
After entering tty, query the pid number of tty7:
ps -t tty7
# 会得到tty7的pid号码<pid>
And then execute
sudo kill <pid>