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When I follow the CD instructions from ubuntu win7 gives "selected disk image isn't valid" and pendrive installer doesn't see the .iso file. I can see it with windows explorer. Any ideas?

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Please add some more details about the situation. What you are trying to do and what happened?. What do you mean by "Pendrive installer"? –  Anwar Shah Jun 12 '12 at 5:10
    
I'm downloading Ubuntu Desktop 12.04 LTS 64 bit. Pendrive is the recommended usb installer on the main ubuntu download page. Checksums don't match. I''m going try retry my downloads. –  Alex Jun 12 '12 at 14:36
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@aking1012 You might want to make an answer from your comment, since Alex has indicated that the MD5SUM indicated a corrupted .iso image (so he'd probably accept your answer, assuming that's the only problem, which is most likely). –  Eliah Kagan Jun 12 '12 at 19:38
    
I did get a good download and tried making a bootable usb drive per the instructions. The process ran without any error messages but it hangs in syslinux, I'll dig into that next. –  Alex Jun 12 '12 at 21:52
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1 Answer

It's possible that you got a bad/corrupted download.

Download the gnu md5sum utility for windows and check the disk's sum against the sum it should be...

We need to find out if it's actually a bad image before we can fix the problem

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