Issues with MacBook Air Login Password

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Oct 12, 2018
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Submitted by Godwin adoyi on 2 September, 2018 and last modified on 2 September, 2018

Hi,
I recently updated my Macbook Air 2015 to the latest version of High Sierra. But now my Macbook Air will not accept my logging password. Whenever I try to sign in with my password, I always get an error message "logging failed".I tried resetting my password via single user mode but was unsuccessful , i kept getting "Permission Denied" in the terminal.I successfully reset my password from recovery mode but when i login with the new password i still get the same error "Login Failed". What is the remedy?