The appearance of the first three options is dependent upon the layout of the disk to which you are installing Ubuntu. Are there any other installs of Ubuntu on the disk to which you are installing? If not then only "Erase Disk and Install Ubuntu" would appear.
The appearance of the first three options is dependent upon the layout of the disk to which you are installing Ubuntu. Are there any other installs of Ubuntu on the disk to which you are installing? If not then only "Erase Disk and Install Ubuntu" would appear.