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I upgraded my Ubuntu OS from 12.10 to 13.04 and after the process of upgrading it via Software Updater , it requested me to restart the computer .

I restarted and on boot I proceed to the Purple with Ubuntu text and 4 dots below it and proceed to the black screen with a blinking underscore (_)

Please help me , i have all my files in there and I can't access them .. I tried the grub menu edit that other questions pointed out but it doesnt seem to do anything .

Please helppp /:

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Try the following:

press Ctrl+Alt+F1

You'll see a terminal for login, enter your credentials and execute the following command:

sudo service lightdm --full-restart

Enter your password again and you should see the login page

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This fixed it for me, thanks! Unfortunately I have to about 50% of the times, any idea why, and how to get it fixed for good? – alemur Jan 13 '14 at 8:37

I dont know if this will help you but, this happened to me after I moved around harddrives from one computer to another. I had a black screen with a comand cursor blinking and taunting me everytime I tried to boot. After reformating and installing and reinstalling. I checked my setup and my comp was booting the wrong hard drive. I swapped the drive order and the bootloader came up.

Again, this was just my experience with the black screen cursur blinking. Solution was:

F2 > boot > swap boot order of drives.

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Have you tried the options listed at this My computer boots to a black screen, what options do I have to fix it? Also, do you have a discrete graphics card, possibly with Optimus technology? If yes, please install bumbleebee project from Bumblebee wiki.

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Apparently this is an issue that can happen, especially with SSD drives.

The solution would be to install gdm and use that instead.

sudo apt-get install gdm

and when prompted, select it. If you want to switych back to lightdm:

sudo dpkg-reconfigure gdm

This is the source.

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