I have a machine with Windows 7 (which apparently isn't being detected) and I'm trying to get it to dual boot W7 and Ubuntu. My BIOS (not UEFI!) is Phoenix Technologies 2.07 and through checking C:\Windows\Panther\setupact.log , I can confirm that it is a BIOS. I also know that the installer (running from USB device) is indeed in legacy mode because there's no splash screen like this: .
And I'm under the 4 partition limit. So, what am I doing wrong? Or is it safe to ignore the warning?
Screenshots and command outputs Warning: "No EFI system partition was found. This system will likely not be able to boot successfully, and the installation process may fail." Crash message: "The 'grub-efi-amd64-signed' package failed to install into /target/. Without the GRUB boot loader, the installed system will not boot."