New answers tagged arm
The Ubuntu for ARM Images are here: http://www.ubuntu.com/download/arm
Chromebook series have some ARM laptops. Unfortunately, it has no real advantage against x86 in laptops under Linux, except of being able to run Android apps after serious fiddling. ARM laptops have no longer battery life because screen and video card consume much more power than CPU.
What's close to a PC/Laptop is the AC100: https://wiki.ubuntu.com/ARM/TEGRA/AC100
As far as I'm aware, there is no Ubuntu port for Surface RT, though you can run Ubuntu on Surface Pro Those are completely different types of computers that are entirely incompatible with each other.
As you can see in the PPA's package list, there's only i386 and amd64 packages available. You can contact the PPA maintainer to request building armhf packages.
Top 50 recent answers are included