MySQL 的 Access denied for user 'debian-sys-maint' 錯誤訊息修復

Debian Linux 升級、重啟 MySQL 時,遇到下述錯誤:

/usr/bin/mysqladmin: connect to server at 'localhost' failed error: 'Access denied for user 'debian-sys-maint'@'localhost' (using password: YES)'

該怎麼修復呢?

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