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Thread: operating system not found after updates

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  1. #1
    Join Date
    Oct 2012
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    10

    operating system not found after updates

    Hi, My computer is a Lenovo x120e AMD 64. I have been running Ubuntu 12.04 LTS since April with no significant problems. Today, I installed recommended security updates which is something I do regularly. The system required restart to complete the updates and so I restarted the computer. Upon restart, I now get the error message "Operating System not found". I switched the bios to diagnostic mode and I see where the computer is finding my hard drive, "Fixed Disk: WDC etc." Prior to this problem, my hard disk was operating normally with no loud noises or other indications of a problem.

    Unfortunately, I no longer have a good usb start up disk and this computer does not have a CD drive. I do have another computer running 12.04 but I have not installed the most recent updates on that one and it works fine. I do not, however, have a fast enough internet connection to download another copy of the operating system.

    Am I the only one having this problem? What should I do next?

  2. #2
    Join Date
    Jun 2009
    Location
    0:0:0:0:0:0:0:1
    Beans
    4,341
    Distro
    Xubuntu 13.04 Raring Ringtail

    Re: operating system not found after updates

    make sure the bios is set to boot the hdd, remove any sd card/usb drive and see if it boots
    you can also use the boot menu and select your hdd there
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  3. #3
    Join Date
    Oct 2012
    Beans
    10

    Re: operating system not found after updates

    Thanks for the quick response. I have tried each of your suggestions and have the boot order set to hdd first. There are no periphery devices attached to the computer. Same error "Operating System not found".

    I opened the back of the computer, removed the hard drive and replaced it, no change. I have an enclosure for a SATA drive so to check to make sure that the disk was good, I put it in the enclosure and mounted it on my other computer. My files are all visible. I ran disk utility and the disk is good with no bad sectors.

    Unless the Lenovo's controller is bad, I believe the problem must be related to the security updates that I just installed. Is there a way to go back to the previous state of the drive before the updates? Can I do this with the disk as an external drive mounted on my working machine?

    Josh

  4. #4
    Join Date
    Oct 2012
    Beans
    10

    Re: operating system not found after updates

    So I was able to get a bootable usb start up disk and have used it to boot the Lenovo. The WDC hard drive is visible in the file system menu. I used disk utility to check the disk and adapter and everything is good.

  5. #5
    Join Date
    Nov 2009
    Location
    Segur De Calafell, Spain
    Beans
    11,686
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: operating system not found after updates

    Boot into live mode with the stick if you can, open Gparted and check whether you have the boot flag on any partition on the hdd. Some systems don't boot without any boot flag even though linux doesn't need it to work (unlike windows).

    If there is no boot flag, set it on one of the partitions. If you have windows, set it on the partition where windows is.
    If you have only ubuntu, set it to any partition, for example the root partition, but not to an extedned one. It has to be either primary or logical.

    You set the flag by right-clicking a partition in Gparted and selecting Manage Flags.

    See if that helps.
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 12.04 LTS 64bit & Windows 7 Ultimate 64bit

  6. #6
    Join Date
    Oct 2012
    Beans
    10

    Re: operating system not found after updates

    Thanks for the suggestion,

    I booted in using a live cd on a usb stick. I opened GParted and saw the HDD. A boot flag was set for sda1 with is a FAT32 100mb partition. There were no flags on the ext partition or the swap partition. Still, when I try and boot normally, it finds the HDD, beeps and goes to a screen that reads "Operating System not found". Is there a way to replace the boot partition with a new version without wiping the entire disk? What else can I try?

    Josh

  7. #7
    Join Date
    Aug 2013
    Beans
    1

    Re: operating system not found after updates

    Hi

    I updated my Ubuntu yesterday and now I have the same messag when I try to start my Laptop. It says "Operation System not found"

    I don't see any solutions in this thread. How did you solve the problem when even a re-installation of Ubuntu didn't help.

    Any ideas?

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