FIXED: Ubuntu 11.10 hangs after upgrade from 11.04: "Waiting for network configuration" then black X screen

Here's a fix for this problem, which I saw after upgrading a VMware Fusion 4.1.1 machine from Ubuntu 11.04 to 11.10.
Solution from: http://uksysadmin.wordpress.com/2011/10/14/upgrade-to-ubuntu-11-10-problem-waiting-for-network-configuration-then-black-screen-solution/

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