How to change default boot options in linux?

Change Default boot options

To change default boot options after full installation of Ubuntu/Mint Linux use Grub Customizer. After full installation, Ubuntu/Mint linux is set to be the default operating system to boot up if no key is pressed within a few seconds on a multi-boot system. You might want to make the other OS as default operating system. This can be done easily by using Grub Customizer.

1. Install Grub customizer by following following commands

sudo add-apt-repository ppa:danielrichter2007/grub-customizer
sudo apt-get update
sudo apt-get install grub-customizer

2. Launch grub-customizer by typing it in terminal or from menu option.

change default boot options

How to install KDE desktop in Linux Mint 15 Olivia

To add the KDE desktop environment to Linux Mint 15

1. Open a terminal window.

2. Type in the following commands then hit Enter after each.

KDE Standard

sudo apt-get install kde-standard

KDE Full Package

sudo apt-get install kde-full

KDE Plasma Desktop

sudo apt-get install kde-plasma-desktop

KDE Plasma Netbook Edition

sudo apt-get install kde-plasma-netbook

Kubuntu Desktop

sudo add-apt-repository ppa:kubuntu-ppa/backports
sudo apt-get update
sudo apt-get install kubuntu-desktop