Did you installed Flight 6 using the Live CD installer? Take a look at bug 38333 (and the recipe to solve the problem in one of the comment) I have a similar problem on my laptop: after creating a swap partition, I can try hibernate once, but this willl then corrupt the swap file.
-- GDM Choices Cause Sleep and Hibernate Failure https://launchpad.net/bugs/43114 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
