Ubuntu18.03 fixing login error due to crashed extensions

Today, after installing a desktop extension, the system crashed and back to the login interface. After entering the password, the screen splash and back to the login interface again. Restarting the computer does not fix the problem. I found many tutorials on the Internet, including modifying the permissions of Xauthority, which is not suitable for my situation. Later, I found an effective solution and take this as a note.

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