[scholia]

I've talked to some OEMs about this.

(1) They find that offering one Linux isn't much of an advantage even for Linux users, since so many people have a different preferred distro. Even people who buy a laptop running Ubuntu are likely to replace it with something else, currently Mint.

(2) Supporting Linux is a very expensive nightmare, especially if you try to do it in 30 languages across 50 countries. Selling Linux laptops to newbies is a loss-making proposition, so you only want to sell to geeks and businesses that can look after themselves. And they're the people who install their own OS anyway.

(3) It's not such a big deal to sell business machines with FreeDOS or something similar. With consumer laptops, the pre-installed crapware basically pays for Windows. Business laptops don't have (or shouldn't have) pre-installed crapware so OEMs are not losing to much on installation fees. The exception is probably the anti-virus program, which delivers big bucks if the user signs up and pays.