[Bug 1387976] [NEW] Unable to boot with persistent data enabled

[Anthony O.]

Public bug reported:

As said on "askubuntu" http://askubuntu.com/q/543675/29219 , I was
unable to boot an usb stick created with usb-creator-gtk with
persistence data enabled (usb-creator-gtk from Ubuntu 12.04 LTS Desktop,
target image : Ubuntu 14.04.1 Desktop).

Here was the looping message when booting, paused a while on the "Scanning disc for index files..." part:
stdin: Not a typewriter
umount: can't umount /cdrom: Device or resource busy
/init: line 7: can't open /dev/sr0: No medium found
stdin: Not a typewriter
/init: line 7: can't open /dev/sr0: No medium found
stdin: Not a typewriter
umount: can't umount /cdrom: Device or resource busy
/init: line 7: can't open /dev/sr0: No medium found
stdin: Not a typewriter
/init: line 7: can't open /dev/sr0: No medium found
stdin: Not a typewriter
umount: can't umount /cdrom: Device or resource busy
/init: line 7: can't open /dev/sr0: No medium found
Generating locales...
  fr_FR.UTF-8... done
Generation complete.
pwconv: failed to change the mode of /etc/passwd- to 0600
Using CD-ROM mount point /cdrom
Identifying... [d0f03a23b18ebd55964c351e853c5b6f-2]
Scanning disc for index files...
stdin: Not a typewriter
stdin: Not a typewriter
stdin: Not a typewriter
stdin: Not a typewriter
umount: can't umount /cdrom: Device or resource busy
/init: line 7: can't open /dev/sr0: No medium found
stdin: Not a typewriter
/init: line 7: can't open /dev/sr0: No medium found
stdin: Not a typewriter
umount: can't umount /cdrom: Device or resource busy
/init: line 7: can't open /dev/sr0: No medium found
stdin: Not a typewriter
/init: line 7: can't open /dev/sr0: No medium found
stdin: Not a typewriter
umount: can't umount /cdrom: Device or resource busy
/init: line 7: can't open /dev/sr0: No medium found
Generating locales...
  fr_FR.UTF-8... done
Generation complete.
pwconv: failed to change the mode of /etc/passwd- to 0600
Using CD-ROM mount point /cdrom
Identifying... [d0f03a23b18ebd55964c351e853c5b6f-2]
Scanning disc for index files...

I tried the workaround proposed there
https://bugs.launchpad.net/ubuntu/+source/usb-
creator/+bug/492301/comments/17 without any success.

** Affects: usb-creator (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1387976

Title:
  Unable to boot with persistent data enabled

Status in “usb-creator” package in Ubuntu:
  New

Bug description:
  As said on "askubuntu" http://askubuntu.com/q/543675/29219 , I was
  unable to boot an usb stick created with usb-creator-gtk with
  persistence data enabled (usb-creator-gtk from Ubuntu 12.04 LTS
  Desktop, target image : Ubuntu 14.04.1 Desktop).

  Here was the looping message when booting, paused a while on the "Scanning disc for index files..." part:
  stdin: Not a typewriter
  umount: can't umount /cdrom: Device or resource busy
  /init: line 7: can't open /dev/sr0: No medium found
  stdin: Not a typewriter
  /init: line 7: can't open /dev/sr0: No medium found
  stdin: Not a typewriter
  umount: can't umount /cdrom: Device or resource busy
  /init: line 7: can't open /dev/sr0: No medium found
  stdin: Not a typewriter
  /init: line 7: can't open /dev/sr0: No medium found
  stdin: Not a typewriter
  umount: can't umount /cdrom: Device or resource busy
  /init: line 7: can't open /dev/sr0: No medium found
  Generating locales...
    fr_FR.UTF-8... done
  Generation complete.
  pwconv: failed to change the mode of /etc/passwd- to 0600
  Using CD-ROM mount point /cdrom
  Identifying... [d0f03a23b18ebd55964c351e853c5b6f-2]
  Scanning disc for index files...
  stdin: Not a typewriter
  stdin: Not a typewriter
  stdin: Not a typewriter
  stdin: Not a typewriter
  umount: can't umount /cdrom: Device or resource busy
  /init: line 7: can't open /dev/sr0: No medium found
  stdin: Not a typewriter
  /init: line 7: can't open /dev/sr0: No medium found
  stdin: Not a typewriter
  umount: can't umount /cdrom: Device or resource busy
  /init: line 7: can't open /dev/sr0: No medium found
  stdin: Not a typewriter
  /init: line 7: can't open /dev/sr0: No medium found
  stdin: Not a typewriter
  umount: can't umount /cdrom: Device or resource busy
  /init: line 7: can't open /dev/sr0: No medium found
  Generating locales...
    fr_FR.UTF-8... done
  Generation complete.
  pwconv: failed to change the mode of /etc/passwd- to 0600
  Using CD-ROM mount point /cdrom
  Identifying... [d0f03a23b18ebd55964c351e853c5b6f-2]
  Scanning disc for index files...

  I tried the workaround proposed there
  https://bugs.launchpad.net/ubuntu/+source/usb-
  creator/+bug/492301/comments/17 without any success.

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