The "init line7... /dev/sdb" part of the error message appeared on a Ubuntu 
12.04.2 64 bit 2G install media created on a 32 bit Ubunti 12.04 up to date 
system.  Startup disk creator was used, the iso was md5sumed and sha1sumed with 
no errors.  The "try" action was requested and the message was repeating under 
the cycling dots (made visible with an ESC).  Performing the drastic and 
potentially descructive "pull media/reinsert media", the boot then continued 
successfully.  I then successfully installed to an 8G USB, but it would not 
boot, not even getting to grub -- even after making the disk/device corrections 
(bug 384633).  I reinstalled grub using the 32 bit system onto the 8G 64 bit 
stick, and then the boot got to the grub screen.  From there, the devices/disks 
could be edited again, but results were mixed, apparently because sda is not 
necessarily the hard disk anymore.  The usual fix for grub  after a manual 
change is to run update-grub, but if the disks are lettered wrong (hard disk 
sdb, 8G USB sda), the update will still be wrong.  
*** Looks like the 3.5+ kernels are (sometimes) redefining the disk order, 
which is NOT compatible with what grub sees/expects.
Similar issues with 12.10, with the first grub.cfg created with the USB on sda 
instead of the expected sdc (bug 384633).  Again, much manual corrections of 
the wrong devices eventually got a booting stick, but haven't done much with 
12.10.

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https://bugs.launchpad.net/bugs/817145

Title:
  Unable to find a medium containing live file system

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