[update] Install Seafile with NGINX on Ubuntu 16.04

[Rajakavitha1]

_ Incorporated the changes after checking that the msql-server package works on the latest version of Ubuntu.
_ fixes: #6571

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[wildmanonline]

@Rajakavitha1 Both the issue and your comment mention testing on the latest version of Ubuntu, but this guide is for Ubuntu 16.04. Can you confirm that the instructions work on Ubuntu 16.04 or should we update this guide's title and text to use version 22.04?

[Rajakavitha1]

@Rajakavitha1 Both the issue and your comment mention testing on the latest version of Ubuntu, but this guide is for Ubuntu 16.04. Can you confirm that the instructions work on Ubuntu 16.04 or should we update this guide's title and text to use version 22.04?

Hi @wildmanonline !!! you are right i tested and validated on the latest version. I could not test it on 16.04 because it is not listed in the cloud manager. May be it makes sense to update the title with the version 22.04.