If you want a path of least resistance, IMO, boot to live and mount your
drive.  Recover your critical data if you have an external drive or NAS
available for holding.  Wipe the drive, probably using fdisk and removing
all the partitions would be sufficient.  Then run the installer for a fresh
build.

Option two is to do a grub repair which is doable but outside my expertise.

-- Fred

On Tue, Jan 3, 2017 at 10:06 AM, Michael Eager <ea...@eagercon.com> wrote:

> The Fedora 23 installation on my laptop will not boot.  grub.cfg
> is missing, for some reason.  I don't have a backup and trying to
> rebuild grub.cfg seemed a bit problematic.  (I'm able to awkwardly
> boot into a Ubuntu install on the laptop and I have a bit of concern
> that running grub-install will end up breaking that.)
>
> I wanted to repair/upgrade the F23 install with F25.  Booting the
> Live DVD, there isn't an option to repair/upgrade an existing
> install, and when I try to do a new install, the installer will
> not let me install over the existing F23 root.  (When I select the
> old root partition as /, it will not add it to the new install
> partitions.)
>
> The Fedora documentation that I find says that the Live CD/DVD does
> not support doing an upgrade, I need to use a bootable DVD.  The
> documentation says that an existing install will be automatically
> recognized when it is booted.  I'm not able to find a complete
> bootable image for Fedora 25 Workstation.  When I found the spins
> of Fedora 25, each seems to be a Live image, not bootable.
>
> Q:  Is a complete bootable Fedora 25 Workstation image available?
>
> Q:  Is the Fedora 25 Server image a complete bootable DVD including
>     KDE?
>
> Q:  Is there a way to tell the Live installer to upgrade/replace
>     an existing installation?
>
> Q:  Is there another path to upgrading a damaged installation?
>
>
> --
> Michael Eager    ea...@eagercon.com
> 1960 Park Blvd., Palo Alto, CA 94306  650-325-8077
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>
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