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Linux Open Source Ubuntu

Upgraded to Ubuntu Server 18.04 LTS

Was remarkably easy to upgrade over SSH (which is good as I am not in the Linux command line world as often these days!) https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes

Have also applied many of the hardening steps at:

https://blog.ubuntu.com/2018/07/30/national-cyber-security-centre-publish-ubuntu-18-04-lts-security-guide

Well worth a read if you are running Ubuntu and want to improve security. Not mentioned on there (probably as its more about using Ubuntu as an end user device rather than a server) is to review the SSH config and harden the SSH service.