Comment 2 for bug 1050436

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Joseph Salisbury (jsalisbury) wrote : Re: Up/Down arrow keys are not recognized during the grub menu on amd64+mac

Can you follow the "Boot options" instructions on the following wiki to enable additional output on boot:

https://wiki.ubuntu.com/DebuggingKernelBoot

As mentioned on the wiki, it would be great if you can attach a log file which may have captured any messages you see. If you are unable to capture a log file, a digital photo will work just as well. As a last resort you can even copy messages down by hand.