

DNSSEC is a means of authenticating the data receives was not tampered with, such as MITM attacks, thus ensuring data integrity. It uses PKI but it’s not an alternative to DoH or DoT which encrypts the DNS traffic, either over HTTPS or TLS, providing confidentiality.
DNSSEC can be used in conjunction with DoH or DoT to achieve the Security CIA triad - Confidentiality, Integrity, Authenticity.
Ya, I must have started using Linux well after Ubuntu made it really easy to install drivers.
Granted you do need to know where to find the option to install drivers, at least you used to maybe its even easier now, but I havent used Ubuntu in a few years.
Once you found where the option to install was it was a click of a button