Re: Incorrect password Debian 10.8 after installation

From	David Christensen <dpchrist@holgerdanske.com>
Newsgroups	linux.debian.user
Subject	Re: Incorrect password Debian 10.8 after installation
Date	2021-02-10 00:00 +0100
Message-ID	<BGK9c-76i-5@gated-at.bofh.it> (permalink)
References	(1 earlier) <BGap4-Ud-15@gated-at.bofh.it> <BGlXc-dm-23@gated-at.bofh.it> <BGnYZ-1te-1@gated-at.bofh.it> <BGqWR-3nn-11@gated-at.bofh.it> <BGDho-2WW-11@gated-at.bofh.it>
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On 2021-02-09 07:35, David Wright wrote:
> On Mon 08 Feb 2021 at 18:26:22 (-0800), David Christensen wrote:
>> On 2021-02-08 15:15, David Wright wrote:
>>> On Mon 08 Feb 2021 at 13:02:21 (-0800), David Christensen wrote:
>>>> On 2021-02-08 00:40, Marco Möller wrote:
>>>>
>>>>> You could bypass any password request during boot to the console
>>>>> and then fix it by setting the desired password newly. The boot
>>>>> parameter for bypassing all password request an right away
>>>>> becoming logged in as user root is:
>>>>>        init=/sbin/sulogin --force
>>>>
>>>> That is interesting.  But, how does the reader *use* that information[?] ...

>>
>> My WAG (untested):
>>
>> 1.  Power up the computer.
>> 2.  The GRUB menu should be displayed:
>>
>>          *Debian GNU/Linux
>>           Advanced options for Debian GNU/Linux
>>
>> 3.  Press the down arrow key to highlight "Advanced options for Debian
>> GNU/Linux".  Press <Enter> to select it.
> 
> If you're heading for sulogin, I'm not sure it matters which line you
> pick, as it means s(ingle)u(se)rlogin.

Testing confirms that I can edit either boot entry and get the same result.


>> 4.  A second GRUB menu should be displayed (the OP should have a newer
>> kernel):
> 
> Yes, you warned us you're using stretch.
> 
>>          *Debian GNU/Linux, with Linux 4.9.0-9-amd64
>>           Debian GNU/Linux, with Linux 4.9.0-9-amd64 (recovery mode)
>>
>> 5.  Press the down arrow key to select the "... (recovery mode)" boot
>> entry.  Press 'e' to edit it.
>>
>> 6.  The GRUB editor should start and display the contents of the
>> selected boot entry.  Look for the line that begins with 'linux'.  Use
>> the cursor keys to move the insertion point to the end of that line
>> and add the following kernel boot parameters:
>>
>>          init=/sbin/sulogin --force
>>
>> 7.  "Press Ctrl+x or F10 to boot".
>>
>> Is the above correct?
> 
> Yes. 

Testing confirms the above steps.


> AIUI --force deals with the case where there is no root
> password/the root account is locked.

Testing confirms that if there is a valid root password, it must be 
entered to obtain a root shell.


>> 2.  How do I insert a tab character with the GRUB editor?  (Pressing
>> <Tab> causes the editor to attempt command completion.)
> 
> I think Greg's guess was good. You don't need tabs or any other cosmetics.

Testing confirms that leading tabs are not required in a GRUB boot entry.


>> 3.  Will changes made to a boot entry with the GRUB editor persist for
>> subsequent boots?
> 
> No.

Testing confirms that changes made to a boot entry via the GRUB editor 
do not persist beyond one boot.


David

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Thread

Incorrect password Debian 10.8 after installation John Berden <john.berden4@gmail.com> - 2021-02-08 03:50 +0100
  Re: Incorrect password Debian 10.8 after installation Andrei POPESCU <andreimpopescu@gmail.com> - 2021-02-08 09:30 +0100
  Re: Incorrect password Debian 10.8 after installation Marco Möller <talby@debianlists.mobilxpress.net> - 2021-02-08 09:50 +0100
    Re: Incorrect password Debian 10.8 after installation Keith Bainbridge <ke1thrboz@gmx.com> - 2021-02-08 10:50 +0100
    Re: Incorrect password Debian 10.8 after installation David Christensen <dpchrist@holgerdanske.com> - 2021-02-08 22:10 +0100
      Re: Incorrect password Debian 10.8 after installation David Wright <deblis@lionunicorn.co.uk> - 2021-02-09 00:20 +0100
        Re: Incorrect password Debian 10.8 after installation David Christensen <dpchrist@holgerdanske.com> - 2021-02-09 03:30 +0100
          Re: Incorrect password Debian 10.8 after installation Anssi Saari <as@sci.fi> - 2021-02-09 08:30 +0100
            Re: Incorrect password Debian 10.8 after installation David Christensen <dpchrist@holgerdanske.com> - 2021-02-09 08:40 +0100
              Re: Incorrect password Debian 10.8 after installation <tomas@tuxteam.de> - 2021-02-09 10:00 +0100
                Re: Incorrect password Debian 10.8 after installation Anssi Saari <as@sci.fi> - 2021-02-09 17:30 +0100
                Re: Incorrect password Debian 10.8 after installation David Christensen <dpchrist@holgerdanske.com> - 2021-02-09 23:00 +0100
                Re: Incorrect password Debian 10.8 after installation Erwan David <erwan@rail.eu.org> - 2021-02-10 07:50 +0100
                Re: Incorrect password Debian 10.8 after installation Stefan Monnier <monnier@iro.umontreal.ca> - 2021-02-09 23:30 +0100
                Re: Incorrect password Debian 10.8 after installation Greg Wooledge <wooledg@eeg.ccf.org> - 2021-02-10 13:40 +0100
          Re: Incorrect password Debian 10.8 after installation Greg Wooledge <wooledg@eeg.ccf.org> - 2021-02-09 13:50 +0100
            Re: Incorrect password Debian 10.8 after installation David Christensen <dpchrist@holgerdanske.com> - 2021-02-09 23:00 +0100
              Re: Incorrect password Debian 10.8 after installation David <bouncingcats@gmail.com> - 2021-02-09 23:20 +0100
          Re: Incorrect password Debian 10.8 after installation David Wright <deblis@lionunicorn.co.uk> - 2021-02-09 16:40 +0100
            Re: Incorrect password Debian 10.8 after installation David Christensen <dpchrist@holgerdanske.com> - 2021-02-10 00:00 +0100

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