A brand new Dell Latitude E7450, with a fresh installation of Ubuntu 14.04.2. Sometimes a pressed key repeats until another key is pressed. This is presumably a BIOS bug.
Here's a discussion about it in Dell's community website.
Since Canonical have certified this model, I have opened a launchpad question about it.
Since Dell works closely with Canonical on their products, I was wondering whether Canonical can get a formal reply from Dell about this issue (which apparently affects most if not all Linux distributions).