4.3 Preparing an SD Card
4.3.1 Formatting the SD Card
It is recommended to format the SD card for operating system installation in advance. If there is any unnecessay files on it, you should erase all the contents and adjust the SD card format to fit operating system installation.
4.2.2 About Installing Multiple Operating Systems
In the Raspberry Pi, the operating system is installed on the SD card, which allows multiple operating systems to be installed simultaneously on one SD card. The user has the advantage of selecting and working the required operating system from among the installed operating systems on the computer.
If you have multiple operating systems installed, you will be presented with a screen to select the operating system you want to use when booting your system. At this time, you will select a specific operating system and boot the selected operating system. If you do not select a particular operating system, the operating system that was selected immediately before this booting is designated as the default, and the booting operation is performed.
4.2 Overview of Installing Operating System
4.2.1 Installation Method of Operating System
You can use the following methods to install the operating system on Raspberry Pi:
● How to buy an SD card with an operating system installed in advance
You can purchase an SD card that already has an operating system already installed on the market. This method can be used for novice users or user to want a simple installation and it is advantageous to use the Raspberry Pi system immediately upon purchase.
4.1 Types of Operating System
4.1.1 List for Installable Operating Systems
● General purpose operation systems
■ Raspbian
■ Debian 6.0 (Squeeze)
■ Pidora (Fedora Remix)
■ Ubuntu
■ Occidentalis
Chapter 4 Installing Operating System
Chapter’s Main Topics
This chapter describes how to install and configure the operating system on your Raspberry Pi system. It introduces the types of operating systems that can be installed in Raspberry Pi, and it explains in detail the various ways to install the operating system actually.
It includes descriptions on the following topics:
■ Type of Operating system
■ Overview of installing operating system
■ Preparing an SD card
■ Installation using utility
■ Installation using operating system image
17.8 Upgrade of System Kernel and Firmware
The kernel and firmware of the Raspberry Pi system are continuously being upgraded to fix errors, improve system performance, and provide additional functionality. If a certain period of time has elapsed since the installation of the Raspberry Pi system, the currently installed system may be different from the system of the latest version. Also, if a specific application is developed based on the latest version of the system, it may cause an error if the program is used on the system of the previous version. Therefore, it is sometimes necessary to upgrade the kernel and firmware.
17.7.3 “apt-get upgrade” Command- Reflect Updated Program
If a program already installed on the system is modified afterward, it is necessary to replace it with a new program. This is done using “upgrade” command in “apt-get” command.
17.7.2 “apt-get update” command – Update Local Package DB
The “update” command is used to update the program package information in the local package repositoroty installed on the system to the latest version. When this command is executed, the package information stored in the local package repository is updated to the latest version, and the latest package file for the installed program is downloaded and archived.
17.7 Update and Upgrade of Program
17.7.1 Upgarde of Program
The package managed by the package repository manages software distribution and metadata in the form of archive files. When a package is installed on a specific computer, the metadata contained in the package is stored in the local package database. In this local package database, typical information such as software dependency and version is managed. The package manager uses this local package database to prevent discrepancies between software and missing essential items.
17.6.2 Cleaning Program Package File
During the process of installing or upgrading programs, the related program package file is downloaded and stored in the local repository “/var/cache/apt/archives/”. These files are not deleted and remain intact even if the program installation is completed or the program is removed. If these files continue to accumulate, it will take up unnecessary storage space in the system, so it’s a good idea to remove any files that is no longer needed.