*** This bug is a duplicate of bug 1161771 ***
    https://bugs.launchpad.net/bugs/1161771

Hi, 
the iso I used is: ubuntu-12.04.5-alternate-amd64.iso 
the hardware I was on is a Macbook Air 4,2 (Mid2011), installing Ubuntu without 
any other OS on the disk.
I lost a day of attempts, after using unetbootin I tried to make a "UEFI only" 
usb stick (extracting the content of the iso directly to the usb stick, there 
is a manual page of Ubuntu) but I always got the error of this bug. 

The solution I found was to create the usb installer with usb-creator-gtk on 
another ubuntu 12.04 and it worked flawlessly, 
same steps as before but no errors. 

I managed to install the system with efi partition and efi grub (I think, I 
still have to check). 
While installing, at the boot of the mac (pressing alt to choose the boot 
device) when using the unetbootin and "UEFI only" it gave me 2 coiches: and 
"Windows" and "EFI Boot" for the same usb stick. 
Using the usb-creator-gtk usb stick I had only "Windows".  
I don't remember if I got the same corruption error also using the Windows 
choiche.

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https://bugs.launchpad.net/bugs/1130381

Title:
  Ubuntu 12.04.2-server-amd64 fails to install

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