Upgrading system causes new kernel images to be installed and the old kernel images are left as is it for use in case any unexpected error is encountered. when you are satisfied that the new kernel image is booting and working properly you just might want to remove the old kernel images.
to do so you may try one of the two steps
1. become super user by "su - " and entering the superuser password then do " rpm -q kernel" for the list of kernels installed then doing "rpm -e kernel-version". this will automatically edit the grub boot loader.
2. as superuser delete the image file and the config file with the system map of the kernel you want to delete in /boot directory manually then do "nano /boot/grub/menu.lst" for deleting the kernel image entry in grub bootloader.
this might solve your problem.
cheers!!
Sumit gupta
CSE Deptt.
NIT Durgapur
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