Does deleting a partition below Ubuntu mess up grub?

[Colin Law]

On 12 October 2014 17:11, William Scott Lockwood III <scott at guppylog.com> wrote:
>
> On Sun, Oct 12, 2014 at 8:35 AM, Colin Law <clanlaw at gmail.com> wrote:
>>
>> Thanks, but I am not sure if that is the problem.  Looking in
>> /boot/grub/grub.cfg it contains direct references to sda numbers, so
>> my memory was that grub looked for the wrong partition.  Perhaps my
>> memory is wrong, however, and it was mounting the drives that caused
>> the problem due to having sda numbers in fstab.
>
>
> UUID mounts aren't all that hard, and they allow you to reorder partitions
> without things mounting in the wrong place. It would certainly solve this
> problem, as well as some others, like accidentally leaving a USB device
> logged in and then having the system not boot correctly.

That confuses me, Robert says that grub cannot use UUIDs, so if it is
expecting to boot from /dev/sda5 and sda5 is no longer the same
partition then it will not boot.

Colin