Re: New Grub2 verses Debian 9.5 -boots slow and strange?

[Pascal Hambourg]

Le 18/10/2018 à 22:26, address@hidden a écrit :
> On Thu, 18 Oct 2018, Pascal Hambourg wrote:
>
> > Le 18/10/2018 ? 21:24, address@hidden a ?crit :
> > > On Thu, 18 Oct 2018, Pascal Hambourg wrote:
> > > > run update-grub after the system is started.
> >        ^^^^^^^^^^^
> > > That said, I found no grub-update command in this version??
> >                         ^^^^^^^^^^^
> > update-grub, not grub-update.
> >
> > >      I tried grub-install --force /dev/sdb but with no effect.
> >
> > Of course not. The wrong root= parameter is in /boot/grub/grub.cfg. 
> > grub-install does not touches this file.
>
>     Tried install-grub - didn't include Debian 9 in the grub boot menu??

Can't your read properly ? For the last time, the proper command is 
*update-grub*. Not grub-update, grub-install, install-grub or whatever 
your imagination may invent...

>     Started over.
>
>     Booted from grub2 memory stick.
>
>     Debian 9 started OK.
>
>     Ran update-grub2.

update-grub2 is just a symlink to update-grub.

>     Ran grub-mkconfig.

Useless if you don't redirect the output tot /boot/grub/grub.cfg, and 
redundant with update-grub if you do.

>     SD now boots :). Nice that it boots. Very strange and slow boot?

What do you mean ? What is strange and slow ?

IME SD card and USB flash drive access from the BIOS can be quite slow, 
until the kernel and initramfs are loaded.

>     Also, there is no need to try to boot anything except this SD since 
> I plug in this SD I want to boot Debian 9.5. I guess I need to edit 
> something? /boot/grub/grub.cfg makes sense, but says not to edit it and 
> it is not obvious what to edit in the files referenced by grub.cfg.

What do you mean ? The boot menu shows other systems than the one 
installed on the SD card ? This is because of os-prober. Either 
uninstall os-prober or edit /etc/default/grub and add

GRUB_DISABLE_OS_PROBER=true

to disable it, and run update-grub again in both cases.