Ubuntu on the Nexus 7

It's "Ubuntu Core" not Ubuntu, as the target this cycle to work out the plumbing issues while the device is running a desktop-like workload.

"there is need to root it via some sort of exploitable vulnerability first." I believe "not" is missing in that sentence.

ClockworkMod is not required to be flashed on to the tablet at all. Not sure why that paragraph is included.