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I updated my 12.10 installation on a T430 thinkpad to kernel 3.5.0-28. After restarting, it would boot into grub but then hang on a blank purple screen when trying to boot with kernel 3.5.0-28. Booting with kernel 3.5.0-27 worked fine.

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I took your solution and put it in the answer as a community-wiki item so I don't get rep from it. You can mark that as an accepted answer after a while. – Thomas W. May 2 '13 at 22:33
up vote 0 down vote accepted

(Used the OP's solution that they posted in their question and made it an answer)

When I booted into kernel 3.5.0-27, I looked at apt-get and saw that the package linux-signed-image-generic had been held back. After upgrading linux-signed-image-generic by running apt-get update and apt-get dist-upgrade and restarting, booting into kernel 3.5.0-28 works.

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I had the same problem while trying to boot kernel 3.5.0-28, grub didn't launch Ubuntu and hanged on a purple screen. I started to use the kernel 3.5.0-27, it worked for one day, at the next boot, it was also giving a similar problem (hanging on a black screen this time). I solved the problem by running apt-get update and apt-get dist-upgrade, now the kernel 3.5.0-28 works fine.

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