When installing Ubuntu 18.04, Canonical's installer will offer to send some statistics to them. Canonical have now released some of this. One thing to note, is that this data does not include Ubuntu Server, Ubuntu Core, cloud images or and any other Ubuntu derivatives that don't include the report in their own installer.
They've had some good results from it, with 66% of people sending them their data although they don't mention how many results this is actually from. It's a nice start, but I think they really need to do some separation of physical and virtual machines, since it seems they're merged together which will skew a bunch of the data I would imagine. If you're interested in seeing what data is sent on Ubuntu, it can be found in "/.cache/ubuntu-report/".
Their data shows that 98% of people are using the 64bit version on Ubuntu, which lines up with our own user survey. On top of that, a desktop resolution of 1920x1080 remains the most popular at 28% with 1366x768 being the next highest at 25%. What's interesting, is that higher resolutions have a pretty low use with 2560x1440 and 3840x2160 both only seeing 1% although that could easily be watered down due to virtual machines.
One thing that's quite odd is the CPU section under the "Number of CPUs" heading, which claims 27% of people have 4-6 CPUs. Something about that doesn't seem right. 27% of people have at least 4 CPUs in the computer they're installing Ubuntu on? I think they need to improve the wording on this quite a bit just so it's crystal clear on exactly what the statistic represents. Likely CPU cores. I've let them know about it to take a look.
Take a look here at their full statistics page if you're interested.
Article edited and re-posted due to a mess up with the text causing some confusion, mostly my own—apologies.