1.5.3. Installing Signed Packages
Installation for most packages can be done safely (except kernel packages) by issuing the following command:
Once the machine has been safely rebooted using the new kernel, the old kernel may be removed using the following command:
Note
It is not a requirement that the old kernel be removed. The default boot loader, GRUB, allows for multiple kernels to be installed, then chosen from a menu at boot time.