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

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 () 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 ?

2 Answers

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.

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

source: