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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