That's not a bug; it is how UEFI is designed. Specifically, UEFI
requires the OS to make calls to the firmware to register firmware
variables telling it how to boot the OS. Those calls are not available
when the system isn't booted in UEFI mode.
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That is exactly the bug!
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https://bugs.launchpad.net/bugs/1778325
Title:
Installer tries to install in BIOS mode on drive larger than 2 TB
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It is not possible to install in UEFI mode if the installer is not
booted in UEFI mode.
** Changed in: ubiquity (Ubuntu)
Status: New => Invalid
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** Package changed: ubuntu-release-upgrader (Ubuntu) => ubiquity
(Ubuntu)
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https://bugs.launchpad.net/bugs/1778325
Title:
Installer tries to install in BIOS mode on drive larger than 2