MySQL Error Message
Some of the user accounts with SUPER privileges were
disabled because of empty mysql.user.plugin value. If you are
upgrading from MySQL 5.6 to MySQL 5.7 it means that substitution
for the empty plugin column was not possible. Probably because of
pre 4.1 password hash. If your account is disabled you will need
to perform the MySQL upgrade procedure. For complete instructions
on how to upgrade MySQL to a new version please see the ‘Upgrading
MySQL’ section from the MySQL manual.
Reason for the Error
ER_NO_SUPER_WITHOUT_USER_PLUGIN
was added in 8.0.2.