fwiw, I disagree with some of the recent marking of duplications of this
bug.

As Scott James Remnant states above, this bug is for dapper->edgy
upgrades where people have run mkswap by hand. Many of the recent
supposed duplications are from people running feisty who've never seen
this problem before (such as me).

I think what is happening in fesity is that a hibernate/resume is
failing for some reason (or more likely, various reasons), leaving the
user with a swap partition that swapon doesn't like (although I can't be
sure of that because it seems to have stopped happening to me) and so
"correcting" it by resetting their swap, but this of course requires
that fstab and /etc/initramfs-tools/conf.d/resume be updated and this
(please correct me if I'm wrong) is not documented.

Perhaps mkswap could be patched to warn users that they will need to
update these files, or it could be patched to retain the UUID (perhaps
with an option to make a new one)

-- 
After running mkswap, swap space is discarded, system fails to hibernate 
(invalid swap signature)
https://bugs.launchpad.net/bugs/66637
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