Unix   Ubuntu

How to fix «Please login as the user "ubuntu" rather than the user "root"»? (2)
How to become `root` in Debian / Ubuntu? (2)
My `sshd_config` for Ubuntu in Amazon EC2 (2)
How to fix «stop: Unknown instance» for PHP-FPM service stop / restart in Ubuntu? (2)
How to disable auto-turning the screen of in Ubuntu when the user is unactive? (1)