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I am not an experienced Ubuntu user. I updated my existing 12.04 until no more updates were available and then I chose to upgrade my system to version 12.10. All went well (or at least I thought it did) until I was prompted to "Restart" the system. Once I restarted the system I could hear my HDD doing its thing and then saw the screen come on and it said something about either waiting for something to happen (which I chose to do) or press "S" to skip mounting or something like that (I couldn't read it fast enough). Anyhow, the computer locked up and it wouldn't boot into Ubuntu. I powered the system down and restarted it hoping to see the message again, but it didn't return. It just locked up during the boot process and I haven't seen my login screen again.

I have a dual boot configuration with Windows Vista Home Premium (32-bit) and I have never had a problem upgrading in the past. My processor is an AMD 64-bit and I have always used the 64-bit version of Ubuntu with no problems.

I would appreciate your help in this matter.



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marked as duplicate by Eric Carvalho, Warren Hill, Mitch Jun 30 '14 at 10:21

This question was marked as an exact duplicate of an existing question.

The message asking you to press S or M might be this one:

enter image description here

I suppose that it could not mount one of your Disk Drive.

This could be cause by:

  • an error in your file /etc/fstab (this file list how to mount your drives)
    => to solve it, reboot your PC with Recovery mode, in recovery mode menu:

    1. go to Grub option, it will give a message like Updating grub will mount your system in read/write mode. Just chose yes to mount your system in read/write mode. It will update your grub and will exit from Grub menu.

    2. after go to root option and login. Execute following commands:

      $ blkid

      this should give you the UUID of your Disk

      $ cat /etc/fstab

      this should give you the content of your fstab file

      Check that your Disk UUID is listed in there.
      Then please edit your question adding the content of your fstab file to help identify the source of the problem.

  • or caused by a physical wire disconnected, yes it happens sometimes (as you are mentioning a weird noise on 1st reboot)

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