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0e1f616
(Get the code!)
I'll add a comment, but I have no new information (this maybe a red herring though).
This issue does not worry me (I don't recall encountering it actually).
Aaron said
> The only way this could be faked out AFAIK is to boot the installer in the wrong mode (booting in BIOS mode on an EFI system by selecting a legacy boot option, or booting in EFI mode on a system you wanted to use in legacy mode).
Following support questions, and trying to replicate what a user reported (cycles ago now), I managed to boot my hp dc7700 (a ~2005 box so BIOS only!) and have calamares (older version than we're using now) think it's in a uEFI machine as reported on screen as EFI where you select storage device. To achieve this however the ISO needed to be written in a reformat type operation, and not following the Ubuntu documented procedure(s) for writing ISOs. (The install usually failed if I recall correctly here, as it ended up trying to write the boot detail to the RO thumb-drive given that was where it found the ESP which I suspect may have tricked calamares). (I don't believe this is what is being done here though; point being calamares can/could? be tricked).