It is not a bug: the problem comes from that your lyx does not read 1.6 format.
lyx 1.5.7 can open 1.6 files but is not yet backported/updated on 8.10 nor 8.04.
See bug 300029 for the update to 1.5.7.
** Changed in: lyx (Ubuntu)
Status: New => Invalid
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Cannot open lyx-1.6.x files
https://bugs.launchpad.net/bugs/299921
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