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thank you very much!!!!!!

HELP! WAITING ONLINE!

sorry my bad englisho_O

Hi people: I open my linux terminal and input : sudo nano /etc/pam.d/common-auth then I change Line : auth required pam_unix.so to: #auth required pam_unix.so now ,when I reboot PC ,system always show me : password authentication didn't work I can not log in my PC what can I do ?