There used to be a prompt that while worded poorly, did give you the
ability to switch to a bios mode install even though you booted the
installer in UEFI mode, but it was removed in 18.04. Unfortunately,
instead of making it switch to a bios mode install by default, it keeps
with the UEFI install and crashes. This mistake is being tracked in bug
#1668148. Hopefully this will be fixed in 18.04.1, but until then, you
just have to get your system to boot the installer in bios mode. If you
are using a USB stick you can delete the EFI directory to make sure it
can't boot in UEFI mode.
** Changed in: grub-installer (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1767703
Title:
Calling 'apt-install grub-efi-amd64-signed' failed
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