There are one or two devices from Lenovo that get sold with Ubuntu, you have to reeeally look for them though (also it’s only in the US I believe).
Slimbook offers Slimbook OS or whatever you pick from about a dozen.
Tuxedo Computers offers Tuxedo OS and Ubuntu.
NovaCustom also got about a dozen they preinstall.
Same with Star Labs.
System 76 of course got their own Pop!_OS.
Purism got PureOS as well as Qubes.
Laptops with Linux got a huge list.
Ubuntushop.be got, well Ubuntu. As well as a dozen others.
Minifree is more for nerds, offering Debian as well as BSDs. Also installs others if requested.
Nitrokey has Ubuntu, Qubes and Mint.
Framework also work heavily on Linux support, it seems they might offer preinstalls in the future.
I think there also are Juno Computers as well as Entroware if they’re still in business. So yeah… lots of vendors with lots of choices. Most will probably either pick the default (in case of Slimbook or Tuxedo) or just Ubuntu, since they heard that name before.
There are one or two devices from Lenovo that get sold with Ubuntu, you have to reeeally look for them though (also it’s only in the US I believe).
As an anecdote, Framework laptops work great with Fedora 41.