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I'm trying to install 12.04 amd64, but none of the options work. When the cd runs, the options to run,install,and check disk for defects give the following error: "/casper/vmlinuz: file not found". I've already checked the iso with md5sum. Any help would be greatly appreciated.

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Hate to ask this, but could you try redownloading? That really seems like a major corruption issue. – Jjed Apr 26 '12 at 18:12
This sounds like a bad burn of the CD – Jorge Castro Apr 27 '12 at 3:42

Your right guys it was a bad burn. I made around 5 copies before, and all were bad. When i tried a different burner it worked. Thanks.

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Simply delete the .efi extension. Worked for me!

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How should I delete the .efi extension? I have the same problem, but it's on a live CD... no way to edit the contents.... – Bertvan Sep 27 '13 at 18:38
sorry, it's been a while since i did this... i believe i used a live USB rather than a CD for this very reason. perhaps it's possible to remove the .efi before you burn? – Ryan Sep 27 '13 at 19:37

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