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This is really the only right answer. With the Ubuntu drive disconnected, the Windows installer can't screw it up.
– Monty Harder
Commented Aug 14, 2019 at 22:34
A user with 12,000 posts here says that you need to actually run an installation (not just plug in old drive) for grub repair. forums.linuxmint.com/…
– whitelightning
Commented Aug 15, 2019 at 7:46
But, grub repair is not the intent. The OP wants to flash a BIOS/firmware update, which is a Windows-centric task. My answer is intended to allow them to do that without complicating their Ubuntu situation. Any grub repair would be a separate issue and therefore out of scope here.
– K7AAY
Commented Aug 15, 2019 at 15:25
@whitelightning : The post you cite assumes you have only one hard drive and that you let Windows installer modify the boot data on that drive. This answer avoids that complication by preventing that installer any access to your drive with your current Ubuntu install.
– Eric Towers
Commented Aug 15, 2019 at 16:18
@Eric Towers When I have a bootable Ubuntu disc (live installation media not included), the UEFI adds "ubuntu" as a boot device. So, I was thinking that having Windows connected and flashing would erase that. But, I am thinking now that it will automatically get recreated when hooking the Ubuntu drive back up.
– whitelightning
Commented Aug 15, 2019 at 18:07

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