I have a somewhat serious problem. (I am in Ubuntu 12.10) Yesterday, I clicked on the update manager to see if there were any updates. There were about 26, and when I investigated, I saw that they were for a kernel update. The new kernel was 3.5.0-40. (My old working kernel is 3.5.0-39) So I said, sure, I'll update my kernel. After I rebooted, I was stuck on a purple screen, so I pushed the power button and turned off my computer. After a bit of research, I realized the old kernel might work still. So I booted into it, and it worked like a charm. Then, I downloaded a program called Grub Customizer, (you can probably google it), and then changed my default boot entry to the old kernel. Now I don't have to go to the grub2 boot menu whenever I boot up, which is nice. However, I don't like it saying "Mounting ramdisk" whenever I boot up because I use the old kernel, but I can stay on that if there's no fix. So here are my questions:

1.) Is the new kernel not working because of a graphics driver problem? I have a Intel Sandy Bridge Mobile graphics card, which works like a charm. (With the old kernel)

2.) IS IT SAFE TO DELETE THE NEW KERNEL? I CAN NOT AFFORD TO SCREW UP MY COMPUTER! I have found lots of information about deleting old kernels, but not new ones.

3.) If I do delete my new kernel, do I need to change the settings in Grub Customizer again? If so, to what?

Thanks for your help, and if there is no way to fix this, I am O.K. to stay on the old kernel. Thanks for your help/time.