I used the auto installer for Ubuntu on my 24GB drive my disk space looks like this.
kipke@ThePad:~$ df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda2 16395648 3936132 11603608 26% / none 4 0 4 0% /sys/fs/cgroup udev 2981788 4 2981784 1% /dev tmpfs 598380 1100 597280 1% /run none 5120 0 5120 0% /run/lock none 2991888 236 2991652 1% /run/shm none 102400 32 102368 1% /run/user /dev/sda1 497696 3376 494320 1% /boot/efi