Article 56Y2T slackware64-current: NO ROOT PASSWORD DETECTED

slackware64-current: NO ROOT PASSWORD DETECTED

by
jaloo
from LinuxQuestions.org on (#56Y2T)
install slackware64-current, meet WARNNING: NO ROOT PASSWORD DETECTED.
Press "Yes" to set a root password.
but i got a error:

passwd: Authentication token manipulation error
passwd: password unchanged.

like attached screen-shot shows.

so I can't set my root password, and when login, it can not login with root.
what can i do now?
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