It can be difficult to find a quality Linux distribution that meets your needs. This is partly because there are just too many operating systems from which to choose. My suggestion is to first find a desktop environment that you prefer, and then narrow down your distro search to one that focuses on that DE. For instance, if you like KDE, both Kubuntu and Netrunner are solid choices.
With all of that said, there is another KDE-focused Linux distro that I highly recommend. Called “KaOS,” it is a rolling release, meaning you can always be confident that your computer is running modern packages. Today, KaOS gets its first updated ISO for 2018, and you should definitely use it to upgrade your install media. Why? Because version 2018.01 has fixes for Spectre and Meltdown thanks to Linux kernel 4.14.14 with both AMD and Intel ucode.
Keep in mind, because KaOS is a rolling release, existing users do not need to download the ISO and run any kind of upgrade. Who should download ISO 2018.01? Those that are planning to do fresh installs and want to have updated media on hand.
Submitted by: Arnfried Walbrecht