That’s just about every modern machine these days. There’s an explanation on why you need to do all of that bullocks in the UEFI / BIOS;
Microsoft’s meddling had made it so you have to buy a key in order to install an operating system which isn’t theirs. Some Linux systems have it, but certainly not Ubuntu that I know of. SecureBoot is advertised as a way to keep out rootkits installed via malicious software from your motherboard but a side-effect for Microsoft is as they’ve mandated it, they authorized their systems, and their systems only to use it in some instances, which is a terribly anti-consumer practice.
While SecureBoot being off opens the risk of having the motherboard become infected with a persistent rootkit, due to the more security-orientated nature of open-source software that shouldn’t be a problem, as malicious code has to be authored and executed in some way before that happens, and unless the author of your project happens to be Clement Lefebvre†, you shouldn’t have to worry about their software being compromised by a third party.
†: Clement Lefebvre is the creator of Linux Mint, the event I am bringing up involved poor security on his server allowing an unauthorized third-party to modify and publish a malicious version of his system using the Cinnamon desktop environment. No harm intended, just a cheeky stab at lazy people; Linux Mint is perfectly safe to use these days.
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