Good or bad, useful or not, implementation of the Unified Extensible Firmware Interface and Microsoft’s Secure Boot extension might well foul the fuel driving consumer migration to the Linux desktop.
I have extensive practice with installing various Linux distros on older and new computers. I am handy at setting up disk partitions and dual booting to maintain a working Microsoft Windows OS alongside numerous Linux distros. I also have routinely installed Linux on older and new computers by removing the Windows OS and replacing the entire drive with one or more Linux distros.