Re: UEFI grub install fails
On Wed 20 Aug 2025 at 11:04:01 (+0100), debian-user@howorth.org.uk wrote:
> David Christensen <dpchrist@holgerdanske.com> wrote:
> > On 8/19/25 13:51, Van Snyder wrote:
> > > On Tue, 2025-08-19 at 12:47 -0700, David Christensen wrote:
> > >> When my eyes saw 9 partitions, my old brain thought GPT and
> > >> skipped:
> > >
> > > When I bought the Dell Latitude E5470 it came with Windoze 10 on an
> > > MBR disk — and without installation media and product codes. I
> > > shrank it and installed Debian. Sorry for being so stupid that I
> > > didn't just blow it away, but I need to use it about twice per year.
> > >
> > > Let me know when you develop a method to convert a drive from MBR to
> > > GPT without blowing away the partition table.
> >
> > *I* do not have to -- Duck Duck Go is our friend. STFW "windows 10
> > convert mbr to gpt":
> >
> > https://html.duckduckgo.com/html?q=windows%2010%20convert%20mbr%20to%20gpt
> >
> > The first hit is:
> >
> > https://learn.microsoft.com/en-us/windows/deployment/mbr-to-gpt
> >
> > MBR2GPT | Microsoft Learn
>
> If you read that page, you'd see it says:
> * There are at most three primary partitions in the MBR partition
> table
> and
> * The disk doesn't have any extended/logical partition
>
> I don't think Van Snyder's disk meets those [c]onditions, so I don't
> suppose the page is relevant.
Agreed, an automatic program like mbr2gpt.exe, designed for vanilla
Windows, is not going to be able to figure out the workarounds required.
But if the OP is intent upon converting the disk, a more manual approach,
like that described in:
https://www.rojtberg.net/1032/converting-a-ubuntu-and-windows-dual-boot-installation-to-uefi/
https://learn.microsoft.com/en-us/archive/technet-wiki/14286.converting-windows-bios-installation-to-uefi
might make it possible. (Myself, I'd stick to switching booting modes
until that imstallation of Windows becomes obsolete or is dispensed with.)
Cheers,
David.
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