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The version of my Ubuntu is 16.04 LTS. After Ctrl+Alt+F1, I enter the tty1. The first thing to do is to login. But when I input my username and press the enter, I cannot input the password. And it repeatedly print login incorrect.

1 Answers1

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I think the problem is the kernel version 4.15.0-43-generic.

Remove 4.15-0-44-generic and 4.15-0-45-generic:

sudo apt-mark hold linux-*-4.15.0-4[45]-generic
sudo apt remove linux-*-4.15.0-4[45]-generic

Install 4.15.0-43-generic

sudo apt install linux-{image,headers,modules,modules-extra}-4.15.0-43-generic

Instructions copied from here