Are There No Certified Laptops?

The entries for Dell laptops on the certified hardware list apply specifically to the pre-installed version. Dell does not, in fact, pre-install Ubuntu on any laptop that I can find.

The same is true for HP and Lenovo (both HP and Lenovo have told me they don't install or support Linux). For all of these vendors' machines, the hardware certification explicitly applies only to the pre-installed version. In every case that I've found for all three of these vendors, the certified hardware list says:
"Standard images of Ubuntu may not work at all on the system or may not work well, though Canonical and computer manufacturers will try to certify the system with future standard releases of Ubuntu."

This means effectively that Ubuntu is not certified on any laptop from any of these vendors, and all the entries that say the pre-installed version is certified are false, since there are no preinstalled versions from these vendors.

Is it, in fact, possible or reliable to run Ubuntu on a laptop from Dell, HP, or Lenovo?