Canonical has reverted the Intel Microcode update released on November 11th, 2020 for all supported Ubuntu Linux releases to address a regression causing boot failures on some Intel Tiger Lake systems.
It used to be that Intel was the go-to source for your processor, but AMD has clearly blown them out of the water the past year and past them by. This only adds to the reasons to not use an Intel processor-based system. The question is, did Canonical not test the patch enough or at all?
New security vulnerabilities are affecting all Linux systems running certain Intel processors. On November 10th, Intel released a new Intel Microcode firmware for Linux systems, and new Linux kernel versions were made available as well to address these new flaws.