I\'m trying to set the password of the user root but I\'m gettin the error below, any idea?
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Those are all good answers, but don't quite touch the deep cause of the problem one most likely has if faced with the OP question. That is, not knowing the ORIGINAL "starting" password created during the installation time.
And all these command lines with "-u root ..." etc. imply knowing and using THAT password.
Now this part from the original installation message may help anyone facing the problem above:
Initial password for first time use of MySQL is saved in $HOME/.mysql_secret
ie. when you want to use "mysql -u root -p" first you should see password
in /root/.mysql_secret