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Have installed Ubuntu 11.10 on USB using Live CD. Followed the steps as provided in below link

After installation is complete in Refit menu, when i click on Linux icon I receive "Missing Operating System" message. I followed the steps provided in the below link from this forum, but am still receiving the same message.

Unable to boot: Missing Operating system

Any assistance is highly appreciated.

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Use an optical drive if you can. Otherwise you need to hope one of the answers here works: – Chan-Ho Suh Mar 23 '12 at 8:20
possible duplicate of How do I get my Mac to boot from an Ubuntu USB key? – Javier Rivera May 3 '12 at 11:35

you can try this, I've not tried it yet though..

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Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Eliah Kagan Aug 23 '12 at 16:44

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