Supported Architectures from the Ubuntu Installation Guide by OnWorks

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Ubuntu 18.04 supports six major architectures and several variations of each architecture known as “flavors”. One other architecture (IBM/Motorola PowerPC) has an unofficial port.

Architecture	Ubuntu Designation	Subarchitecture	Flavor
Intel x86-based	i386
AMD64 & Intel 64	amd64
ARM with hardware FPU	armhf	multiplatform	generic
ARM with hardware FPU	armhf	multiplatform for LPAE-capable systems	generic-lpae
64bit ARM	arm64
IBM POWER Systems	ppc64el	IBM POWER8 and newer machines
IBM z/Architecture	arm64	IBM Z and IBM LinuxONE, no s390 (31-bit mode) support	zEC12 and newer machines