The installer does warn that you should not proceed with a UEFI install,
but yes, it is poorly worded and many people don't understand it.
** Changed in: grub-installer (Ubuntu)
Status: New => Invalid
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Bugs, which
Update: I didn't realize this Desktop could distinguish between 'legacy
bios' and UEFI in the firmware (bios). My existing operating systems are
installed in legacy bios mode. When I booted from the USB installer
using firmware's boot chooser, I chose the UEFI version without
realizing the