If you are attempting to install Ubuntu alone on the disk, the installer will create the first partition as a primary partition. And that first partition, following the recommendation made earlier, should be mounted at /boot. The default file system for /boot on Ubuntu is ext2. You can use that, or ext4, the default journaling file system on Ubuntu 11.04. The partition number of this boot partition, if it is the first partition on the disk, will be /dev/sda1. While many Linux distributions assign about 500 MB of disk space to /boot, only about 30 MB is used on a new installation of Ubuntu 11.04. If you are tight on disk space, you can go as low as 50 BM, but keep in mind that disk usage on /boot will grow with each upgrade. Click OK to create it.
Now that /boot has been created, select the free space and click on Add to create other partitions. Note that this step will have to be repeated for all other partitions.
The second partition will be for Swap. The installer will attempt to create it as a logical partition, but you do not have to. Like /boot, it could also be a primary partition. The first logical partition of an extended partition is /dev/sda5. If you create this partition as a primary partition, it will be /dev/sda2.
Select “Swap area” from the “Use as” dropdown menu. The “Mount point” menu will be disabled because Swap does not need a mount point. A disk size of 2000 MB or 2 GB is usually good enough for Swap. Add.
The third partition will be for /. The installer recommends a minimum of 4.4 GB of disk space for installing Ubuntu 11.04, but on a new installation, just 2.3 GB of disk space is used. As more applications are installed on a running system, disk usage will grow, so you want to be very generous here – if you have disk space to spare. The default file system on a non-boot partition is ext4. Other options available are ext3, xfs, jfs and reiserfs. Btrfs is also a file system option, but the disk partitioning scheme for installing Linux on a btrfs file system is slightly different from this one. That will be covered in another article.
OK to create this partition.
The final partition will be for /home. The file system is ext4, and you may use the available disk space here. OK
Back to the main manual partitioning window, you can see all the partitions just created. Before you click Install Now, you have to determine where GRUB, the boot loader, will be installed. On a standalone installation, the best location is the default – in the Master Boot Record of the disk. It is also possible to install it in the /boot partition, but that is not recommended for this installation.