Delete linux kernel installed from source code

To uninstall the kernel which installed from source code before, you need to manully delete some files:

• /boot/vmlinuzKERNEL-VERSION
• /boot/initrdKERNEL-VERSION
• /boot/System-mapKERNEL-VERSION
• /boot/config-KERNEL-VERSION
• /lib/modules/KERNEL-VERSION/
• Update grub configuration file /etc/grub.conf or /boot/grub/menu.lst to point to correct kernel version.

to update grub use:

sudo update-grub