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Lost power during upgrade, how do I recover?

My upgrade from Ubuntu 12.04 to 12.10 got cancelled due to the power being cut off, now Ubuntu is not starting. What can I do? I run windows 7 and Ubuntu. So please help me to get out of this mess because all my files were in Ubuntu. And also I had installed a lot of apps in it. If I loose it I will be in trouble. Please help.

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marked as duplicate by Jorge Castro, Stephen Myall, Mitch, Gilles, Mik Oct 24 '12 at 23:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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What precisely do you mean by "not starting"? Is Ubuntu completely refusing to boot, is it booting but you are only getting a command-line login prompt, or is it giving you a GUI but it is broken? Please elaborate. Also, is GRUB working properly (can you still boot Windows)? –  InkBlend Oct 24 '12 at 4:22
    
Actually First time i opened it after power cutoff it showed me a page asking to mount something or skip dis task without mountuing but the computer got hanged so i had to restart it from restart button and after restarting now ubuntu after booting is just showing a black screen just before when usually the ubuntu desktop used to come.. and i am able to open my windows.. and is it possible to solve this problem by using a repairable live CD or a pendrive?? –  Aditya Oct 24 '12 at 5:04

2 Answers 2

Press ctrl alt f1 and then login there. after that type as

 sudo dpkg-configure -a
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@alvar thanks man . –  AgentCool Oct 24 '12 at 6:30
1  
Know the feeling dude. –  Alvar Oct 24 '12 at 13:43

1] If you're able to boot, but after login Unity doesn't load: It's possible that your GPU drivers are interfering; or that your hw isn't 3d-capable. Please post the result of the following command (press CTRL+ALT+T) :

$ /usr/lib/nux/unity_support_test -p

A. If you're using nVidia drivers: Run the following command to remove them, and reboot:

$sudo apt-get purge nvidia-current $sudo apt-get remove nvidia-current-updates $sudo apt-get remove nvidia-experimental-304 Or just open Synaptic and search for nvidia, delete everything that you see now.

Reboot the system. See if everything's working. Run this command to check if Unity-3D will work:

$ /usr/lib/nux/unity_support_test -p

Reboot again. Reinstall latest nVidia drivers:

$ sudo apt-get install nvidia-current-updates

B. If using AMD/ATI GPU drivers: Run the following command to remove them, and reboot:

$ sudo apt-get purge fglrx

Don't reinstall them as ATI cards currently don't support Unity-3D.

2] If you're unable to boot: Insert a Ubuntu 12.10 Live-CD/DVD and run the following commands:

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

sudo apt-get install -y boot-repair && boot-repair

Boot-Repair will launch. Select the 'Recommended Repair'.

3] IF you fail to see the Grub:- Insert a Ubuntu 12.10 Live-CD/DVD and run the following commands:

$sudo mount /dev/sdXY /mnt # XY is the drive, eg. sda or sda1

$grub-install /dev/sdX#X is drive number

$update-grub

Reboot. Lemme know if it doesn't work as intended.

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