Same here on my MacBook. But I solved it thanks to your instructions.
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https://bugs.launchpad.net/bugs/990847
Title:
Unity broken in Ubuntu 12.04 after upgrade VAIO VGN-SR
To manage no
I was able to restore the system this way:
1. Booted with a previous kernel (3.0.x) which gave me back a mouse and the
terminals
2. Switched to a terminal ALT+CTRL+F1
3. Configured the network card (both wireless and wired cards where
unconfigured)
3. sudo apt-get update && sudo apt-get upgrade
