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Accepted
Anthony O.
Asked: 2014-10-31 08:28:29 +0800 CST

Trying to boot from USB "Scanning disc for index files..."

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I'm trying to boot an Ubuntu 14.04.1 LTS USB stick, and it seems it will never enter the Desktop.

I'm stuck on the bootscreen, and here are the lines when I press "ESC" :

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...

It blocks a long while on "Scanning disc for index files...", then writes all the following and re-blocks on next Scanning disc for index files....

I used the usb-creator-gtk program to build my USB stick, with persistent data enabled.

As somebody seemed to have the same problem (http://www.reddit.com/r/linuxquestions/comments/2dsgd5/cant_boot_from_cdusb_to_install_ubuntu/) I tried the solution from there (adding nomodeset), but I still have the same results: blocked at the bootscreen (not really hanged because the little dots are still "alive")...

Does somebody have an idea what happens ?

14.04

2 Answers

  1. Try copying the whole text it's more helpful that way:

    If you got this bug, when you boot from USB, press F6 then edit the boot option: Remove this:

    file=/cdrom/preseed/ubuntu.seed

    Add these:

    live-media-path=/casper/ ignore_uuid

    Full sample:

    append boot=casper initrd=/casper/initrd.lz live-media-path=/casper/ quiet splash ignore_uuid

    If you don't want to edit every time you boot from USB, you can edit this file in USB: /syslinux/text.cfg

    https://bugs.launchpad.net/ubuntu/+source/usb-creator/+bug/492301/comments/17

    source: https://askubuntu.com/a/51350/72414

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  2. Best Answer

    I finally found a workaround: I created an usb stick with persistent data disabled, and I finally managed to boot correctly!

    I was inspired by comment 15 of the bug chapuzzo point me out.

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