UEFI is fully supported. Note: Linux Mint does not use digital signatures and does not register to be certified by Microsoft as being a “secure” OS. As such, it will not boot with SecureBoot. … Note: Linux Mint places its boot files in /boot/efi/EFI/ubuntu to work around this bug.

Does Linux Mint work with Secure Boot?

Re: how to setup Linux Mint with secure boot enabled.

Ubuntu (on which Mint is based) is fully compatible with the Secure Boot specification. So if the manufacturer did its job correctly (which some do not do, more on that later), then the install will just work with default Secure Boot active.

Can I install Linux Mint in legacy mode?

The “choice” happens when you boot the Mint USB: if it’s booted in UEFI mode, it’ll install Mint in UEFI mode; if it’s booted in legacy mode it’ll install Mint in legacy mode. The Mint USB should appear twice in the boot menu (F10 or whatever), once for UEFI mode and once for legacy, that’s where you can choose.