Step 1
Implement the Debian’s instructions: How to install MySQL 5.7 for Magento 2 on Debian 9 (Stretch)?
Step 2
How to fix non-root login to MySQL in Ubuntu?
Step 3
How to set a non-empty password to the root
MySQL user in Ubuntu?
Implement the Debian’s instructions: How to install MySQL 5.7 for Magento 2 on Debian 9 (Stretch)?
How to fix non-root login to MySQL in Ubuntu?
How to set a non-empty password to the root
MySQL user in Ubuntu?