Dual-Boot Windows and Ubuntu
Ubuntu is available as a "live" CD, which means that you can use it directly
from the CD without installing it. But running an operating system from a CD is
slow, to see what Ubuntu can do running at full speed, you need to install it to
your hard disk.
The ideal situation would be to install Ubuntu on it's own separate hard disk,
but most people don't have two hard drives in their computer, and most people
are not prepared to give up Windows. Therefore they have to install Ubuntu
along-side Windows on the same hard disk in a dual-boot configuration.
Configuring a dual-boot system involves partitioning your hard disk to make
space for Ubuntu. When your computer first starts, it reads information on the
first sector of the hard drive which tells it where to find the "boot loader".
The boot loader is a file with information about the installed operating systems
and how to start them.
The boot loader for Windows is a file named "boot.ini". The boot loader for a
Linux system (like Ubuntu) is GRUB (Grand Unified Boot Loader). When you install
Ubuntu in a dual-boot system, it redirects the system to use GRUB. When you
first start your system, GRUB presents a list of options, including starting
Ubuntu or starting Windows. So you'll still be able to use your Windows
To install Ubuntu, start it with the live CD. To use the live CD, your
computer's BIOS must be configured to boot from the CD drive. It's probably
already configured that way, but if not, when your computer first starts watch
for a message telling you which key to press to access the BIOS setup. Most
computers use the F2, F1, Esc, or Del key.
When the BIOS setup screen appears, select the Boot option, configure the CD
drive in the boot order before the Hard Disk drive, then follow the instructions
to save your change and exit. This change will not effect the normal operation
of your computer except for a slight delay when it starts to check the drive for
a bootable CD.
Because Ubuntu live CD creates itís file system in RAM, it requires a system
with a least 512 MB of RAM. Some sources claim the minimum is 256 MB, but I
havenít had any luck getting Ubuntu live CD to boot on systems with less than
512 MB of RAM.
Installing Ubuntu as a dual-boot system involves partitioning your hard disk
to make space for Ubuntu. If you make a mistake in the partitioning process, you
could lose your Windows operating system. I'm going to explain the partitioning
process in complete detail, so the chances of making a mistake are minimal, but
you should still make a complete back up just in case.
You'll need at least 10 GB of free space for Ubuntu on your hard disk. You
should also leave at least 10 GB of free space for Windows after you install
Ubuntu. So if you don't have at least 20 GB of free space on your hard disk, you
should remove any unnecessary programs and files first.
Then run Windows Disk Cleanup utility to get rid of any other unnecessary files.
You should also run Windows Defragment utility to move the data on your hard disk
to consecutive allocation units, which will make it easier to partition the disk.