Ubuntu comes with an opensource java installed. To use the oracle’s java, you need to remove the openjkd and install oracle’s.

Do chmod on multiple files could be hard if you only use chmod alone. You can use find command to filter files and folder and apply chmod with only one simple line.

Every cloud that you use outside Brazil, does not come with pt-br support installed. When you access your server via SSH, almost every command that you run on terminal, will generate a warn that your language is not supported.

Hostname X FQDN