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1.2.1. Kernel Differences:
Ubuntu version 10.10 and prior, actually had different kernels for the server and desktop editions. Ubuntu no longer has separate -server and -generic kernel flavors. These have been merged into a single -generic kernel flavor to help reduce the maintenance burden over the life of the release.
When running a 64-bit version of Ubuntu on 64-bit processors you are not limited by memory addressing space.
To see all kernel configuration options you can look through /boot/config-4.14.0-server. Also, Linux Kernel in a Nutshell3 is a great resource on the options available.