Hello! I have a Macbook Pro model 7,1, operating system version 10.8.2. I am trying to create a 120gb partition and install a Linux distribution on it. This Linux OS is preferably BackTrack, but may be Ubuntu as well. I have tried Linux USB Builder for Lion. It creates a bootable install disk for Ubuntu but freezes on BackTrack. Any other procedure that supposedly works, I get a message "the disk you inserted is not readable by this computer" when done. When using the USB drive, which now has a bootable Ubuntu installer on it, I am able to boot into Ubuntu, use gparted to create my Linux partition. Then, I run the installer and install the operating system. Once it completes, I then attempt to reboot into the Ubuntu partition. I get "No bootable device found. Insert a boot device and press any key". *** Report for internal hard disk *** Current GPT partition table: # Start LBA End LBA Type 1 40 409339903 Linux ext4 2 409602048 940812503 Mac OS X HFS+ 3 940812504 942082047 Mac OS X Boot 4 942082048 944130047 Linux Swap 5 944130048 944539647 EFI System (FAT) Current MBR partition table: # A Start LBA End LBA Type 1 1 976773167 ee EFI Protective MBR contents: Boot Code: Unknown, but bootable Partition at LBA 40: Boot Code: None File System: ext4 with journaling Listed in GPT as partition 1, Linux ext4 Partition at LBA 409602048: Boot Code: None File System: HFS Extended (HFS+) Listed in GPT as partition 2, type Mac OS X HFS+ Partition at LBA 940812504: Boot Code: None File System: HFS Extended (HFS+) Listed in GPT as partition 3, type Mac OS X Boot Partition at LBA 942082048: Boot Code: None File System: Unknown Listed in GPT as partition 4, type Linux Swap Partition at LBA 944130048: Boot Code: None (Non-system disk message) File System: FAT32 Listed in GPT as partition 5, type EFI System (FAT) Please help!!