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

[jmh6]

On Fri, 19 Oct 2018, Pascal Hambourg wrote:

> Le 18/10/2018 ? 22:26, address@hidden a ?crit :
> > 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.


Hi Pascal,

  I wanted to try to answer your question about I meant by Debian 9.5 boot 
being flaky and slow.

  Here is what happens now. I can't easily capture these screens.

  Power up machine
  Grub screen for a few seconds
  Two lines looking for SD 4:0:0:0 [sdb]

Seems normal except looking for 4:0:0:0 as SDB and not finding anything so 
it gives up eventually?

  Gave up waiting for suspend/resume device

  a few more lines

Boot process decides this is a very slow hard drive so decides to wait for 
it to warm up?

  A start job is running for dev-disk #####.device 1min. 30seconds

At this point a 'normal' boot seems to start and is reasonably fast.

  [  OK  ] -- many many lines :).


  Thanks for all your help.

  My guess at this point would be that when Debian was installed SDB was 
at 4:0:0:0 and that grub or the early Debian boot process goes to look for 
that physical device and does not find it?

  I have not yet tried your NO_PROBER suggestion. If it will help you, I 
will try this also.

  John

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