Ubuntu Core 20 is a major release and comes two years after the previous version, Ubuntu Core 18.
Highlights of Ubuntu Core 20 include hardware-backed full disk encryption for x86 systems via TPM (Trusted Platform Module) integration, which works with exiting CA (Certificate Authority) for a more secure boot that prevents unauthorised software installation and guarantees confidentiality from physical attackers.
Due to Canonical’s 10-year low-cost security maintenance model, Core 18 still be supported for eight more years on business critical deployments