[Bug 1245147] Re: Ubuntu 13.10 does not boot from USB stick 3.0

[Luigi R.]

Thanks Phillips for answering.

Could you help me to understand what the installer is writing to the
mbr? Is grub itself or just something that tell to the bios in which
partition it can find grub?

In the past I used to create a /boot partition, what did it contain?
Grub?

All these question because today I have tried to boot the USB on another
machine with BIOS UEFI in legacy mode and it was able to read it
properly.

I have formatted the key and generated the table partition several time
in msdos under gpated or directly from the installer but it always
starts from sector 32. Reading around this should not happen with those
new tools, isn't it?

How can I force the first sector position? what about using gtp? I do
not now if "old" bios (~2yrs old machine) can read it.

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Title:
  Ubuntu 13.10 does not boot from USB stick 3.0

Status in “grub2” package in Ubuntu:
  Incomplete

Bug description:
  I have tried to perform a normal installation of ubuntu 13.10 on a
  usb3.0 stick sandisk 16Gb, formatted ext4.

  I do not how to provide you more information since grub does not even
  start and a violet screen hangs. I was suspecting a corruption of the
  usb mbr and I have tried updating directly the grub the I have on the
  hard disk used by ubuntu 13.04 and windows 7 with the key plugged in
  but again just violet screen and everything hangs.

  If I create a live usb in fat32 I do not have any problem. Could you
  please verify if there is a bug in ext4?

  Before on the same usb I had Ubuntu 13.04 but in UEFI mode since I was
  using a netbook UEFI. Now for sure I have a bios legacy and for this
  reason I have removed everything to reinstall ubuntu 13.10 in the mbr.

  The usb key has been formatted in gparted recreating again the
  partition table in msdos as follow:

  Le voci nella tabella delle partizioni non sono nello stesso ordine
  del disco.

  Disk /dev/sdb: 15.5 GB, 15504900096 bytes
  64 testine, 32 settori/tracce, 14786 cilindri, totale 30283008 settori
  Unità = settori di 1 * 512 = 512 byte
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Identificativo disco: 0x00018829

  Dispositivo Boot      Start         End      Blocks   Id  System
  /dev/sdb1   *        2048    13632907     6815430   83  Linux
  /dev/sdb2        13635582    30281727     8323073    5  Esteso
  /dev/sdb5        13635584    14684159      524288   82  Linux swap / Solaris
  /dev/sdb6        14686208    30281727     7797760    7  HPFS/NTFS/exFAT

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