I use a laptop with Ubuntu 12.10, after the update installing the kernel 3.5.0-26-generic, I can not boot my computer on this kernel, I arrive on a Busybox terminal page, with initramfs. I can still boot when using the previous version of the kernel. I compared the configuration of both kernel, thinking that there may be a problem in the compilation,the only difference is "CONFIG_SATA_AHCI=y" for 3.5.0-25 and "CONFIG_SATA_AHCI=m" for 3.5.0-26, I tried a new download and compilation of 3.5.0-26 kernel but it changed nothing.
Since this happened, my Grub takes far more time to appear, and always after i press some key on the keyboard, and the loading of a previous kernel is quite long also, with the message 'loading ramdisk'.
Thanks in advance for your attention.