anna 

Anna’s Not Nearly APT. Installs packages which have been retrieved from the chosen mirror or CD. 

user-setup 

Sets up the root password, and adds a non-root user. 

clock-setup 

Updates the system clock and determines whether the clock is set to UTC or not. 

tzsetup 

Selects the time zone, based on the location selected earlier. 

partman 

Allows the user to partition disks attached to the system, create file systems on the selected partitions, and attach them to the mountpoints. Included are also interesting features like a fully automatic mode or LVM support. This is the preferred partitioning tool in Ubuntu. 

lvmcfg 

Helps the user with the configuration of the LVM (Logical Volume Manager). 

mdcfg 

Allows the user to set up Software RAID (Redundant Array of Inexpensive Disks). This Software RAID is usually superior to the cheap IDE (pseudo hardware) RAID controllers found on newer motherboards. 

base-installer 

Installs the most basic set of packages which would allow the computer to operate under Ubuntu when rebooted. 

apt-setup 

Configures apt, mostly automatically, based on what media the installer is running from. 

pkgsel 

Uses tasksel to select and install additional software. 

os-prober 

Detects currently installed operating systems on the computer and passes this information to the bootloader-installer, which may offer you an ability to add discovered operating systems to the bootloader’s start menu. This way the user could easily choose at the boot time which operating system to start. 

bootloader-installer 

The various bootloader installers each install a boot loader program on the hard disk, which is necessary for the computer to start up using Linux without requiring further (removable) media, like floppy or CD-ROM. Many boot loaders allow the user to choose an alternate operating system each time the computer boots. 

