The Latest Kernel Update Broke My MacBook Air. How Can I Fix It?

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http://askubuntu.com – I installed 12.10 on my 11-inch mid-'11 Air without a hitch. I removed Unity and installed Cinnamon in its place. I purged every Unity-related package from the system. Today, the kernel updated and broke my machine. I can't get to the GRUB menu and I am told that the computer is running in low-graphics mode, even though I can't do anything with the options presented by the dialogues. nmcli refuses to connect to my network. I need a way to get the system working again, preferably without using a reinstall or install disk. lspci -nn | grep VGA produces: 00:02.0 VGA compatible controller [030 (HowTos)