There are more than 30 installation CDs (or about 5 DVDs) for this newly released Debian GNU/Linux 5.0 and the installation is just for x86 processor architecture. And each CD image (.iso) downloaded is full of 650MB CD image. However, if we get a whole set of CDs or DVDs, we will end up installed with a lot of packages that we won't actually use it. In the words, Debian has pretty of software packages to choose from.
We may also download just the "netinst" CD image, it contain only a small portion (less than 200MB) of Debian required to start the installation process ("Configuring Package Manager", or apt), and the installation process, you can define whatever we want (supplement software), those will be downloaded from internet (may refer as "network mirror").
If we choose not to use network mirror (I believe it is referring to "internet debian mirror sites"), and if the installation CD is created from "netinst" image, then we will end up with only a very minimal base system.
The packages in each CD/DVD are all sorted by popularity, for example, he first CD/DVD contains the installation of base system and also the most popular packages. The second one contains slightly less popular ones, the third one even less popular ones, etc. We will probably only need the first DVD (or the first two CDs) unless we have very special requirements. In case we need a package later on which is not on one of the CDs/DVDs that we have downloaded, we can always install that package when the computer is connected to Internet.
After the base system is installed and configured, it prompts for password for root account and also to setup a local user. In Expert mode, we can decide whether root account should be enabled. If it is disabled, then root commands required to start with 'sudo' command, so this is similar to the default configuration for Ubuntu.
My preferred mirror sites for Debian downloads:
http://ftp.tw.debian.org/debian-cd/
http://ftp.kr.debian.org/debian-cd/
http://ftp.hk.debian.org/debian-cd/
We may also download just the "netinst" CD image, it contain only a small portion (less than 200MB) of Debian required to start the installation process ("Configuring Package Manager", or apt), and the installation process, you can define whatever we want (supplement software), those will be downloaded from internet (may refer as "network mirror").
If we choose not to use network mirror (I believe it is referring to "internet debian mirror sites"), and if the installation CD is created from "netinst" image, then we will end up with only a very minimal base system.
The packages in each CD/DVD are all sorted by popularity, for example, he first CD/DVD contains the installation of base system and also the most popular packages. The second one contains slightly less popular ones, the third one even less popular ones, etc. We will probably only need the first DVD (or the first two CDs) unless we have very special requirements. In case we need a package later on which is not on one of the CDs/DVDs that we have downloaded, we can always install that package when the computer is connected to Internet.
After the base system is installed and configured, it prompts for password for root account and also to setup a local user. In Expert mode, we can decide whether root account should be enabled. If it is disabled, then root commands required to start with 'sudo' command, so this is similar to the default configuration for Ubuntu.
My preferred mirror sites for Debian downloads:
http://ftp.tw.debian.org/debian-cd/
http://ftp.kr.debian.org/debian-cd/
http://ftp.hk.debian.org/debian-cd/
Newly installed Debian Lenny 5.0 with DVD 1, the content of /etc/apt/sources.list
deb cdrom:[Debian GNU/Linux 5.0.0 _Lenny_ - Official amd64 DVD Binary-1 20090214-19:45]/ lenny contrib main
deb http://security.debian.org/ lenny/updates main contrib
deb-src http://security.debian.org/ lenny/updates main contrib
deb http://volatile.debian.org/debian-volatile lenny/volatile main contrib
deb-src http://volatile.debian.org/debian-volatile lenny/volatile main contrib
We may put some remark (block it from system interpret it) : (1) first line repo from disk media that is "deb cdrom" and any lines that start with "deb-src" which is referring to repo for source code.deb cdrom:[Debian GNU/Linux 5.0.0 _Lenny_ - Official amd64 DVD Binary-1 20090214-19:45]/ lenny contrib main
deb http://security.debian.org/ lenny/updates main contrib
deb-src http://security.debian.org/ lenny/updates main contrib
deb http://volatile.debian.org/debian-volatile lenny/volatile main contrib
deb-src http://volatile.debian.org/debian-volatile lenny/volatile main contrib
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