Things You'll Need
Instructions
Insert your external USB hard drive into your PS3's USB port. Select "Settings," "System Settings," "Backup Utility." Select "Backup" and select your external USB hard drive as the backup location. This ensures you don't lose any data when adding Linux.
Select "System Settings," "Format Utility" on your PS3. Choose "Format Hard Disk" and select "Yes" to confirm your choice. Choose "Custom" and select "Allot 10GB to the Other OS." Select "Quick Format," then "Yes." Press "X" to reboot your PS3.
Attach your USB mouse and keyboard to the PS3's USB ports.
Insert your Ubuntu installation CD into the PS3's disc drive. Select "System Settings," "Install Other OS." Select "Other OS," "Yes" to reboot your PS3 and add Linux.