Ubuntu: Ubuntu 12.04 not starting (dual boot)



Question:

On my dual booting laptop, I have Windows XP and Ubuntu 12.04. I've had XP on the laptop for years, and install Ubuntu 12.04 a few months ago. For some reason, Ubuntu 12.04 has stopped working.

When I power on the laptop, I get the grub menu, and I can select Windows XP or Ubuntu 12.04. If I select Windows XP, it boots up perfectly and I can use it as normal. However, if I select Ubuntu 12.04, It just displayed a terminal type blank screen with no text except the blinking cursor, but no commands execute if I try typing something in.

How do I fix this so I can boot back into Ubuntu 12.04? I know I can try a reinstall, but I don't want to lose the files I have in Ubuntu 12.04. Is it possible to somehow do a repair?


Solution:1

There are many things that could have happened.

  • you can try reinstalling grub.
  • try booting with usb/live cd and hunt for issue there, ie, disk check, log check
  • you can try to access recovery in the grub menu list, maybe its a graphics error


Solution:2

It is possible that the grub MBR has been damaged, or that it is pointing to the wrong place for Ubuntu.

You can repair the grub using BootRepair (https://help.ubuntu.com/community/Boot-Repair).

Alternatively, you can try this simple procedure first. If it doesn't solve the problem, use BootRepair:

  1. Boot with Ubuntu Live CD

  2. Open terminal (command prompt)

  3. Type: sudo fdisk -l

You will get a list of partitions, similar to the following list:

/dev/sda1 13 102400 de Dell Utility  /dev/sda2 * 13 1926 15360000 7 HPFS/NTFS  /dev/sda3 1926 30892 232676566 7 HPFS/NTFS  /dev/sda4 30893 60802 240245761 5 Extended  /dev/sda5 30893 59584 230467584 83 Linux  /dev/sda6 59585 60802 9777152 82 Linux swap / Solaris   

Ubuntu partition is the one with the name "Linux" (not necessarily the one with the star, although could be). On this case is on '/dev/sda5' so we have to mount it:

  1. sudo mount /dev/sda5 /mnt (replace 'sda5' with the partition name in your case)

  2. And then install grub: sudo grub-install --root-directory=/mnt /dev/sda

  3. Reboot and verify that all is working fine.

Hope that helps!


Solution:3

I had more or less the same problem last week... I booted ubuntu (from hibernation) and when ubuntu had exited the hibernation, I had access to nothing. It is like ubuntu was ok but no launcher, no keystrokes, nothing at all... Nothing was possible... I tried several thing but nothing did... As last resort I reinstalled ubuntu. Great care here. You ask the installer to reinstall an existing installation (no formatting !!!). Your home is preserved ! The installer will reinstall all the packages that were previously installed and it worked for me. var is overwritten, so by example as the home of postgres was in var, this one was gone...


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