Supported by the ARMv7 architecture are ARM Cortex-A8 and Cortex-A9 processor-based systems. The press release regarding this official Canonical port can be read here. After support for Ubuntu on Sun's SPARC architecture was dropped earlier this year (just two years after Canonical announced SPARC support), the primary architectures currently supported by Ubuntu are x86 and x86_64.
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via Twitter or contacted via MichaelLarabel.com.