Confirmed and reproduced in Xubuntu 20.10 as well. This issue is _not_
confined to Ubuntu Unity and is also present in an official remix.
Steps taken to try to resolve it:
* updated system BIOS (machine is a Lenovo Thinkpad W500; was on 3.18, now on
3.23, latest) -> no change
• tried 2 different flavours of 20.10 -> no change
• placed a bootable DOS primary partition (C:), set active, tested OK; no
change.
• installed Windows 7 Enterprise SP1. No UEFI detected, no EFI partition
created, no separate system partition needed or used.
Ubuntu Unity 20.04 went on this machine without a glitch. openSUSE Leap
15.2 was also fine.
The machine does not have UEFI, as far as I can tell. There is no option
to boot in legacy or UEFI mode.
The only way I have discovered to install 20.10 was to tell it my DOS
partition was the EFI System Partition. This worked fine, installed GRUB
into /dev/sda and now it boots.
However this has rendered my DOS partition unbootable, and now it is
mounted at /boot/efi which is not what I want.
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https://bugs.launchpad.net/bugs/1915152
Title:
Installation of Ubuntu Unity 20.10 always fails if there is no EFI
partition
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