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 <eager@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    eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077
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