In my fresh install of 4.2 this error appeared.
> The following error occurred while installing the boot loader. The system will not be bootable.
> Would you like to ignore this and continue with installation?
> Failed to remove old efi boot entry. This is most likely a kernel or firmware bug.
I ignored this and I was able to boot 4.2 with rEFInd so I have no problem. But it would be nice to understand why this happens and how to fix it.
You might have a setting in your BIOS that prevents boot entries from
being removed.
I once had the opposite error where the installer failed to create the
entry. Adding an entry manually with efibootmgr didn't work initially
either, I had to clear the CMOS before I could add an entry. It also
turned out that the efibootmgr command in this section of the docs is
outdated:
The .efi file path was different and the "placeholder /mapbs /noexitboot"
part wasn't needed in my case.
Luckily I had another working Qubes machine where I could dump a working
efibootmgr entry and configure the machine accordingly:
Boot0001* Qubes OS HD(1,GPT,REDACTED,REDACTED,REDACTED)/File(\EFI\qubes\grubx64.efi)
I haven't had time to submit a pull request to update the docs.
Neil du Preez: