
"The openSUSE Project is an Free/Libre Software community developing a Linux distribution named openSUSE. The project is sponsored by a number of companies and individuals, most notably SUSE, AMD, B1 Systems, Heinlein Support and IP Exchange" -- The OpenSUSE Project
This is a step-by-step guide to install openSUSE in Oracle VM.
Before we start, get a copy of "openSuSE 12.2 GNOME Live CD (iso) i686" from this link.
1. Start Oracle VM and click on the New button.
2. Input openSuSE in the Name text field. Usually Oracle VM would automatically search for its version upon typing the name of the OS, but in case it doesn’t, select openSUSE from the Version combo box field. Click the Next button after filling up the necessary fields.

3. Set the memory size to 1024 MB (roughly 1GB) RAM, and click the Next button.

4. Select Create a virtual hard drive now, and click the Create button.

5. Select VDI, and click on the Next button.

6. Select Dynamically allocated, and click on the Next button.

7. By default, the allocated vdd space is set to 8.00 GB, you can set it to any value you are comfortable with, then click on the Create button. Also you can choose where to place your .vdi / virtual drive if you wish. Just click on the Folder with the green caret to choose where to save your .vdi.

8. Now, click on the Start button.

9. If this prompt pops up, click on the folder icon at the right and select your openSuSE 12.2 GNOME Live CD i686 iso file and press Start.

10. Press any key to halt the automatic boot sequence/countdown. Select Installation and press Enter.

11. Upon reaching this screen, you can select the language and the keyboard layout you prefer, by default it is both set to English (US). Click on the arrow button at the lower right corner of the screen to continue.

12. This screen displays the timezone settings, you can change it by clicking and selecting from the Region and the Time Zone combo boxes. Once you’ve selected, click on the Next button.

13. In this screen you can select what type of disk partitioning you prefer. (click on the more link if you wish to know more about which to select. For this guide, since we are installing on a VDI which is set to 8GB (as stated earlier), we are not going to Import any partitions from other Linux systems nor are we going to create a new partition (over the default partition). So click on the Next button to proceed.

14. Fill in the User’s Full Name, Username, Password and Confirm Password text fields here. It is important that you choose a username and password that is easy to remember.

15. This screen displays the summary / details of your preferred installation of openSuSE. If you are satisfied with these – click on the Install button.

16. Once the installation is finished, this prompt would appear, just click on the Reboot Now button.

17. Once the green installer screen reappears, click on any key, and select Boot from Hard Disk.

18. When you reach this screen, you have successfully installed OpenSuSE on your Oracle VM! You may now sign in. (Note: if SuSE prompts to eject the installer iso from the CD Rom, please press eject – so that the next time you would boot up OpenSuse, the system would boot from the virtual drive, and not from the installer iso.).
