This section will help you determine which different media types you can use to install Ubuntu. For example, if you have a floppy disk drive on your machine, it can be used to install Ubuntu. There is a whole chapter devoted media, Chapter 4, Obtaining System Installation Media, which lists the advantages and disadvantages of each media type. You may want to refer back to this page once you reach that section.
Whenever you see “CD-ROM” in this manual, it applies to both CD-ROMs and DVD-ROMs, because both technologies are really the same from the operating system's point of view, except for some very old nonstandard CD-ROM drives which are neither SCSI nor IDE/ATAPI.
CD-ROM based installation is supported for some architectures. On machines which support bootable CD-ROMs, you should be able to do a completely floppy-less installation. Even if your system doesn't support booting from a CD-ROM, you can use the CD-ROM in conjunction with the other techniques to install your system, once you've booted up by other means; see Chapter 5, Booting the Installation System.
Booting the installation system directly from a hard disk is another option for many architectures. This will require some other operating system to load the installer onto the hard disk.
Many Ubuntu boxes need their floppy and/or CD-ROM drives only for setting up the system and for rescue purposes. If you operate some servers, you will probably already have thought about omitting those drives and using an USB memory stick for installing and (when necessary) for recovering the system. This is also useful for small systems which have no room for unnecessary drives.
You can also boot your system over the network.
Diskless installation, using network booting from a local area network and NFS-mounting of all local filesystems, is another option.
After the operating system kernel is installed, you can install the rest of your system via any sort of network connection (including PPP after installation of the base system), via FTP or HTTP.
If you are running another Unix-like system, you could use it to install
Ubuntu without using the debian-installer described in the rest of the
manual. This kind of install may be useful for users with otherwise
unsupported hardware or on hosts which can't afford downtime. If you
are interested in this technique, skip to the Section C.4, “Installing Ubuntu from a Unix/Linux System”.
The Ubuntu boot disks contain a kernel which is built to maximize the number of systems it runs on. Unfortunately, this makes for a larger kernel, which includes many drivers that won't be used for your machine (see Section 8.4, “Compiling a New Kernel” to learn how to build your own kernel). Support for the widest possible range of devices is desirable in general, to ensure that Ubuntu can be installed on the widest array of hardware.
Any storage system supported by the Linux kernel is also supported by the boot system. Note that the current Linux kernel does not support floppies on CHRP systems at all.