Another thing to watch for: If you were previously running xen kernel, and you install a non-xen kernel and remove xen, odds are good that the file /etc/sysconfig/kernel will still have a line in it that says something like: DEFAULTKERNEL=kernel-xen This will then cause the scripts which attempt to auto edit the grub.conf file when updating kernels to get very confused and your newly updated kernel will probably not wind up as the default, so you'll think you updated, but you'll wind up booting the old kernel after all :-). Change the sysconfig line to just: DEFAULTKERNEL=kernel and updates will act more normal-like.
