В Fri, 23 Nov 2012 21:15:36 +0100
"[email protected]" <[email protected]> пишет:

> Dear all,
> 
> This bug is frightening: a user lost access to UEFI firmware (~BIOS)
> after installing Ubuntu12.10(grub-efi2.00):
> https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1082418
> 
> I thought that GRUB didn't modify firmware (at least for Legacy BIOS),
> as this changed for UEFI?

grub-install will try to remove UEFI menu entry for current distributor
and re-add. If something went wrong here, it could explain missing
menu. It removed all entries and re-added back just one for Ubuntu.

Output of "efibootmgr -v" *before* Ubuntu installation (using live
CD) would be useful.

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