[CentOS] 8.2.2004 Latest yum update renders machine unbootable

Sun Aug 2 15:04:58 UTC 2020
david <david at daku.org>

At 07:57 AM 8/2/2020, you wrote:
>On Sun, 2 Aug 2020 at 10:20, david <david at daku.org> wrote:
> >
> >
> > ><snip>
> >
> >
> >
> >
> > > >> Yes .. it should be on mirror.centos.org now .. you could change the
> > > >> repo where your updates come from.  OR 
> .. wait for that mirror to get
> > > >> updated.
> > > >
> > > >
> > > > I just did
> > > > yum clean all
> > > > yum update
> > > >
> > > > and 15-8 showed up.  Maybe the 'clean all'
> > > did it, or maybe just showed up.
> > > >
> > > > I applied the update (yum update), rebooted and...
> > > > no boot.  Just a blank screen.
> > > >
> > > > Hardware is a Mac-Mini :-(
> > > >
> > > > This is not an essential machine, so I could re-install (from
> > > > netinstall) if you think it's worth the effort.
> > > >
> > > > Or what?
> > > >
> > > > David
> > >
> > >You just need to reinstall the kernel and it should work.
> > >
> >
> > Sorry for being so ignorant, but I don't
> > understand "just reinstall the kernel".  I don't
> > know how to translate that into a specific yum or rpm command.
>
>I agree  it is a lot of shorthand because of expectations. In the end
>we (the list) don't know what you have on your system or what state it
>is in. In order to get that information to help we would need you to
>try the following:
>
>1. boot using a working USB/cdrom/netboot path and installer
>2. choose the rescue mode
>3. have the rescue mount the disks as local and chroot into the
>system. << if possible have the system also bring up networking >>
>
>Then
>yum list kernel shim grub2 mokutil
>
>It would also help to know which kind of Mac Mini it is (year, model,
>firmware versions). Apple changes the internal hardware of these
>things and how they boot so if there it may be that a particular model
>is more affected than others.


How does one obtain that information?  There's nothing written on the box.

David