Is it possible to add a kensington lock to a laptop that doesn't have

Solution to no Kensington Lock is the J-Plug Laptop Lock cable 1300mm Steel cable, inserts into the headphone jack offering high security

You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use share alike

kensington nano security slot™ The Kensington Security Slot is part of an anti-theft system designed in the mid 1980s and patented by Kryptonite in 1999–2000, assigned to Schlage in 2002,

kensington security slot adapter kit It would seem that Kensington has identified the lack of a lock slot on ultrabooks and the like They have a solution: