Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Running Linux on Your Mac
If you want to try the latest graphic heavy Ubuntu Linux on your Intel based MAC without reformatting or erasing the partition, there a few things you need to check before you start. You will need
• Minimum 8 GB of free space on the Hard Drive
• Internet access
• ISO Image of Ubuntu
• VirtualBox from Sun Microsystems
The rest goes like this:
1. Download Ubuntu and select Ubuntu 8.04 LTS Desktop for your MAC.
2. Choose any convenient location to save the file and start the download.
3. Move on to ‘VirtualBox’ and download ‘Sun VirtualBox’ for your Mac OS X. Begin the download by clicking on Mac OS X.
4. Wait for the time both the applications get fully downloaded.
5. Install Sun VirtualBox.
6. Once the installation completes, launch VirtualBox and move onto creating a new virtual machine. For this, you need to click on the “New” button, which lies in the top left corner.
7. Name the virtual machine. This will help you in remembering its purpose, which in this case is to run a different operating system. Once renamed, click Next.
8. Here, select Linux as the OS and Ubuntu as the Linux version.
9. Now select Boot Hard Disk (Primary Master) and click on Create new hard disk to select it. Click next.
10. Choose Dynamically expanding storage size.
Once all this is done, run the virtual machine. This will initiate the installation wizard.
To pick the Ubuntu’s ISO image, which you downloaded, select “Cd-DVD ROM Device, and Image File. Now look for the ISO image by clicking on the green arrow folder and search for the location where you saved the ISO image. If you can’t find the downloaded file, move on to Download folder and find the file.
Once this step is done, the virtual machine will boot and you can begin to install Ubuntu in your virtual machine.
• Keep in mind that naming the virtual machine can help a lot in avoiding confusion. Use proper clear names to highlight the role of a specific virtual machine.
• You need not shut down Ubuntu every time you are finished working. Simply press the pause button and you can toggle between Ubuntu and other OS.
• If you get stuck with VirtualBox installation, simply move on to official site and browse for the solution
• Insufficient memory will effect and may even stop the installation process.