Part of this series of posts: Oracle Database 12c on Oracle Linux 6
Type the following command and press Enter.
passwd
Type root at the New password prompt and press Enter (you’ll get the above error messages). Type root at the Retype new password prompt and press Enter.
Note:
See the note about Joes in the Introduction. Never use root as the root password for a system where security matters.
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Cars and Code 
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