Groups > linux.debian.user > #237428 > unrolled thread

How do I mount the USB stick containing the installer in Rescue Mode?

Started by	Stella Ashburne <rewefie@gmx.com>
First post	2021-07-15 11:50 +0200
Last post	2021-07-16 18:00 +0200
Articles	3 on this page of 43 — 12 participants

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#237472

From	Greg Wooledge <greg@wooledge.org>
Date	2021-07-16 13:40 +0200
Message-ID	<CBumd-2kb-1@gated-at.bofh.it>
In reply to	#237465

On Thu, Jul 15, 2021 at 11:43:15PM -0500, David Wright wrote:
> I presume you type /etc/fstab into your post, both because of the
> missing # for the comment, and because the /dev/sr0 line has too
> many fields. It should contain   udf,iso9660 user,noauto
> without spaces after the commas.

The space between iso9660 and user should *also* be a comma.  The
original post was a mess, and I agree, she probably typed it by
hand (with multiple errors -- *all* of the comments were missing their
pound signs, for instance, not just the one you mentioned).

Anyway, this thread has gone on for a ridiculously long time.  She
just needs to identify the correct device name, and create a new
directory in which to mount it.

It's sad that people always somehow think they need to use existing
directories for their mount points.  You can just "mkdir /stella" and
use that, and voila -- no conflicts.  It's an ephemeral system, so you
aren't even "polluting" a "pristine" root file system with your new
directory.  It's all temporary.

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#237473

From	David Wright <deblis@lionunicorn.co.uk>
Date	2021-07-16 17:20 +0200
Message-ID	<CBxN8-4zw-1@gated-at.bofh.it>
In reply to	#237472

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On Fri 16 Jul 2021 at 07:31:41 (-0400), Greg Wooledge wrote:
> On Thu, Jul 15, 2021 at 11:43:15PM -0500, David Wright wrote:
> > I presume you type /etc/fstab into your post, both because of the
> > missing # for the comment, and because the /dev/sr0 line has too
> > many fields. It should contain   udf,iso9660 user,noauto
> > without spaces after the commas.
> 
> The space between iso9660 and user should *also* be a comma.

Eh? Attached is the virgin fstab from my experimental encrypted root
installation. I think it's self-evident why there's a space separating
the two alternative filesystem types from the mount options.

> The
> original post was a mess, and I agree, she probably typed it by
> hand (with multiple errors -- *all* of the comments were missing their
> pound signs, for instance, not just the one you mentioned).

Yes, should have pointed it out. At first reading, I assumed they'd
missed the first character when dragging the mouse, but on rereading,
I saw the other errors, and corrected only those. Of course, there'd
be no mouse pointer to drag in Rescue, so you really can only
transcribe or photograph the text.

> Anyway, this thread has gone on for a ridiculously long time.  She
> just needs to identify the correct device name, and create a new
> directory in which to mount it.

AIUI the device /dev/sdb1 is already mounted. However, by selecting
"execute shell in /d/m/sda-whatsit", the /cdrom mountpoint gets
hidden in the Alt-F1 shell.

> It's sad that people always somehow think they need to use existing
> directories for their mount points.  You can just "mkdir /stella" and
> use that, and voila -- no conflicts.  It's an ephemeral system, so you
> aren't even "polluting" a "pristine" root file system with your new
> directory.  It's all temporary.

Been there, done that. Strictly, the answer to the Subject line is:
"You don't. It's already mounted. It's on /cdrom." Unfortunately,
the other two shells weren't obvious to the OP (or, perhaps, to
anyone else who replied).

Taking a step back, I would have wished that the OP could have booted
the installed system and fixed Grub from there, and never opened this
new topic at all.

Having taken this step back, I see that it hasn't been mentioned that
one of the menu alternatives to "execute shell in /d/m/sda-whatsit"
is "Reinstall Grub". I'm not inclined to go there, as I've been
learning about this Rescue business on a system with a perfectly good
Grub installation that I'm happy to copy bits out of but not change.

Taking two steps back, and looking at the thread "How do I get back
the GRUB menu with the blue background?", I'm at a loss to know why
nobody else has posted what the Grub commands are to boot a system
with encrypted root *and* LVM. (Actually I think it's an encrypted
partition with LVM inside it.) I've posted how to boot a system with
an encrypted root filesystem using raw Grub commands so they can fix
up Grub, but I can't help with their LVM, never having used it.

So many people here say, "Use LVM", "You should be using LVM", "LVM
should be the mainstream default". And yet, no replies are forthcoming.

Cheers,
David.

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#237474

From	Greg Wooledge <greg@wooledge.org>
Date	2021-07-16 18:00 +0200
Message-ID	<CBypP-4LX-7@gated-at.bofh.it>
In reply to	#237473

On Fri, Jul 16, 2021 at 10:17:45AM -0500, David Wright wrote:
> On Fri 16 Jul 2021 at 07:31:41 (-0400), Greg Wooledge wrote:
> > On Thu, Jul 15, 2021 at 11:43:15PM -0500, David Wright wrote:
> > > I presume you type /etc/fstab into your post, both because of the
> > > missing # for the comment, and because the /dev/sr0 line has too
> > > many fields. It should contain   udf,iso9660 user,noauto
> > > without spaces after the commas.
> > 
> > The space between iso9660 and user should *also* be a comma.
> 
> Eh? Attached is the virgin fstab from my experimental encrypted root
> installation. I think it's self-evident why there's a space separating
> the two alternative filesystem types from the mount options.

Ah.  My mistake.

Looking at my own (Debian generated) fstab file now, I see the same
thing on the /dev/sr0 line.  The type and options fields are separated
by only one space, and it looks really weird, especially when all the
lines before that have several spaces between those two fields.

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How do I mount the USB stick containing the installer in Rescue Mode?

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