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If you decided you wanted to upgrade your Ubuntu you might end up in a situation where you get a black screen and nothing after.

After search the net I found this article

http://uksysadmin.wordpress.com/2011/10/14/upgrade-to-ubuntu-11-10-problem-waiting-for-network-configuration-then-black-screen-solution/

Which basically stipulates you do this

1.Hit Ctrl+Alt+F1 at the blank screen to get you to a non-X terminal (tty1)
2.Login in with your username and password
3.Change to root with: sudo -i and enter your password
4.mkdir -p /run /run/lock
5.rm -rf /var/run /var/lock
6.ln -s /run /var
7.ln -s /run/lock /var
8.reboot

Problem with this is that you can’t get the tty1 so boot into single user mode and follow the instructions from point 2 and it will be up and running again. Thanks to the initial author.

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