I upgraded from ubuntu 16.04 to ubuntu 18.04 LTS on my AWS OpenEMR 6.0.0(2) Cloud STANDARD production system, and the upgrade was smooth and very fast. It asked a few questions about ssh (I picked the default options) and “locally modified” versions of obsolete files like grub (I picked the “maintainers version”). Not counting backups, it took only about 15-20 minutes on an AWS t2.large instance (Intel Xenon 2 CPU w 8GB mem and 2x200GB volumes).
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