I seem to have this problem too--however a detail that others have not mentioned is the error message printed before I am dropped to rescue mode:
error: Found two discs with the number 0?!? -- Sam Morris http://robots.org.uk/ PGP key id 1024D/5EA01078 3412 EA18 1277 354B 991B C869 B219 7FDB 5EA0 1078
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