[deanhills]

@"Hidden Refuge".  Didn't know this - wow! 

@youssefbasha In addition to HR's comment that is worth checking up on I checked for a tutorial how to upgrade to Ubuntu 16.4 and this paragraph from Dibital Ocean is worth noting - it's always better to install an upgrade of an OS from scratch rather than upgrading it, and if one upgrades it it is better to test it first in a staging environment before doing it on the VPS.  The tutorial below by digital ocean for how to upgrade to Ubuntu 16.4 is really great and worth checking out:

Potential Pitfalls
Although many systems can be upgraded in place without incident, it is often safer and more predictable to migrate to a major new release by installing the distribution from scratch, configuring services with careful testing along the way, and migrating application or user data as a separate step.

You should never upgrade a production system without first testing all of your deployed software and services against the upgrade in a staging environment. Keep in mind that libraries, languages, and system services may have changed substantially. In Ubuntu 16.04, important changes since the preceding LTS release include a transition to the systemd init system in place of Upstart, an emphasis on Python 3 support, and PHP 7 in place of PHP 5.

Source: https://www.digitalocean.com/community/t...-16-04-lts