It has be solved by running
grub2-mkconfig -o grub.cfg
and
grub2-install /dev/sda
===========================================================================
Patrick DUPRÉ | | email: pdupre(a)gmx.com
Laboratoire interdisciplinaire Carnot de Bourgogne
9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE
Tel: +33 (0)380395988
===========================================================================
>
> On 16.06.2019 16:29, stan via users wrote:
> > On Sun, 16 Jun 2019 16:10:21 +0200
> > "Patrick Dupre" <pdupre(a)gmx.com> wrote:
> >
> >> On one machine, when booting and entering in grub menu to choice the
> >> OS, it points on the 4th one and not on the 1st one.
> >>
> >> How can I manage this ?
> >
> > I've never had that happen. Bizarre! If it happened to me I would
> > check /etc/default/grub to be sure that the grub defaults are what I
> > want, and then run
> > grub2-mkconfig -o grub.cfg
> > in the directory where grub.cfg is.
>
> Check if you have GRUB_DEFAULT=saved in /etc/default/grub and what entry
> is printed: grub-editenv list ?
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