Re: Examine (and fix?) non-booting USB

From	Mike Easter <MikeE@ster.invalid>
Newsgroups	alt.os.linux
Subject	Re: Examine (and fix?) non-booting USB
Date	2019-01-31 11:19 -0800
Message-ID	<gbh01oFb4v2U1@mid.individual.net> (permalink)
References	<gbgos8F9i9qU1@mid.individual.net> <slrnq56gs4.61d.dan@xps-linux.djph.net>

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Dan Purgert wrote:
> Mike Easter wrote:
>> I have two USBs; one which boots to a live partitioned Ub Mate 18.04.1
>> made from an .iso with mkusb* (front end for dd), the other which has
>> the same UbMate installed to the USB using the Ub Ubiquity installer on
>> the live UbMate according to these guidelines**.  The latter does not boot.
> 
> If you _installed_ ubuntu to that usb, where did you install grub?  Not
> /dev/sda by any chance, did you?
> 

No.

When I looked at the problem USB with GPartEd, it didn't look at all the 
same as the USB that boots, but boot-repair has a function to give me a 
summary of what it sees.  Here's a small part of that from the top:

-----------------

=== Boot Info Summary: ===

  => Windows 7/8/2012 is installed in the MBR of /dev/sda.
  => Grub2 (v2.00) is installed in the MBR of /dev/sdb and looks at 
sector 1 of
     the same hard drive for core.img. core.img is at this location and 
looks
     for (,msdos3)/boot/grub. It also embeds following components:

     modules
 
---------------------------------------------------------------------------
     fshelp fat part_msdos biosdisk
 
---------------------------------------------------------------------------
  => Grub2 (v2.00) is installed in the MBR of /dev/sdc and looks at sector
     13401584 of the same hard drive for core.img. core.img is at this 
location
     and looks for (,gpt2)/boot/grub. It also embeds following components:

     modules
 
---------------------------------------------------------------------------
     fshelp ext2 part_gpt biosdisk
 
---------------------------------------------------------------------------

-----------------

The live working USB is 4G sdb, the inop USB install is 8G sdc.  So, I'm 
surprised to see that there is a grub in the mbr of the problem usb.  I 
just need to figure out how to get it seen as a boot device by my 
system.  My boot menu sees the USB but it doesn't boot from it, just an 
instantaneous flash of info seen when there is no boot sector on a device.

-- 
Mike Easter

Thread

Examine (and fix?) non-booting USB Mike Easter <MikeE@ster.invalid> - 2019-01-31 09:16 -0800
  Re: Examine (and fix?) non-booting USB Mike Easter <MikeE@ster.invalid> - 2019-01-31 09:31 -0800
  Re: Examine (and fix?) non-booting USB "Carlos E.R." <robin_listas@es.invalid> - 2019-01-31 18:52 +0100
    Re: Examine (and fix?) non-booting USB Mike Easter <MikeE@ster.invalid> - 2019-01-31 10:24 -0800
  Re: Examine (and fix?) non-booting USB Dan Purgert <dan@djph.net> - 2019-01-31 18:50 +0000
    Re: Examine (and fix?) non-booting USB Mike Easter <MikeE@ster.invalid> - 2019-01-31 11:19 -0800
      Re: Examine (and fix?) non-booting USB "Carlos E.R." <robin_listas@es.invalid> - 2019-01-31 21:48 +0100
      Re: Examine (and fix?) non-booting USB "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2019-01-31 18:18 -0500
        Re: Examine (and fix?) non-booting USB "Carlos E.R." <robin_listas@es.invalid> - 2019-02-01 02:52 +0100
          Re: Examine (and fix?) non-booting USB "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2019-01-31 21:09 -0500

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