Can a company use Ubuntu legally on laptops with hardware which haven’t been certified for use with Ubuntu ?
You seem to be asking two different questions.
- Can a company use Ubuntu legally on laptops with hardware which haven’t been certified for use with Ubuntu ?
Generally ‘yes’. Refer to https://www.ubuntu.com/licensing.
And to https://askubuntu.com/questions/219/under-what-license-is-ubuntu-can-it-be-legally-modified-and-distributed
- What does “Ubuntu Certified” mean?
Refer to https://certification.ubuntu.com/
And to https://askubuntu.com/questions/781123/does-ubuntu-supported-hardware-without-official-certification
…which is essentially a duplicate of https://askubuntu.com/questions/986878/will-my-device-work-with-ubuntu
Since these both seem to be support questions, rather than community or development questions, please follow up in one of the linked support threads.