If you're lucky enough to find some capable 64-bit ARM (AArch64) hardware, the latest open-source Linux packages are working out well in the 64-bit ARM world for providing a decent Linux desktop experience.
64-bit ARM Linux (non-Android) software is getting into shape and becoming mature enough when it comes to day-to-day Linux desktop packages. Red Hat's Marcin Juszkiewicz has written about building a 64-bit ARM Linux desktop using a Mustang development board and tossing in a Radeon HD 5450 graphics card plus two hard drives.
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