Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Specifically, it says

/init: line 7: can't open /dev/sdb: no medium found

I'm trying to install Ubuntu 12.10 on my intel iMac. I have 1 Mac partition, 1 FAT32 partition with Windows installed on it, and 2 MS-DOS(FAT) partitions which have nothing on them yet, if that helps. I am using rEFIt

share|improve this question
If you boot with a live CD, can you see the partitions with fdisk -l? – Ken Kinder Jan 23 '13 at 23:19
I mistyped, 12.10. Thanks for catching my error – Chuck Dries Jan 25 '13 at 3:24
@Ken how do I go about running commands when the UI won't load. The furthest I have gotten is a dark grey bar at the top (no buttons on it) and a pretty purple background when trying to boot from CD. I should note that I do in fact see these things on my display's native resolution, rather than whatever low res the boot menu shows up in (idk if thats relevant, maybe it will help) – Chuck Dries Jan 25 '13 at 23:22
Oh, I thought you meant this happened during the install itself, not when it was just booting off the CD. – Ken Kinder Jan 30 '13 at 22:28
You might try a couple of other distros' live CDs to make sure it's a Linux issue, not one specific to Ubuntu. Also if there's a Mac program that can give you an output like fdisk -l, that would be helpful, but I'm not sure what that Mac app would be. – Ken Kinder Jan 30 '13 at 22:29

So I haven't found the cause of the problem, but I've discovered that if I boot from a CD, but also insert a bootable usb drive, then just ignore it, the live cd will eventually load the normal interface.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.