I believe that the failure only occurs when you intentionally *BREAK*
your filesystem by using data=writeback, so a factor of two performance
penalty for a protection that is unneeded on the default data=ordered
mode is unacceptable to me.  At the very least the syncing should only
be done if data=writeback is detected, or the syncing and renaming
should be delayed until after all packages are unpacked if possible, so
that it is only done once.

Leaving this in for lucid release to be on the safe side is probably the
right thing to do at this point, but this should be revisited later.

-- 
My computer updates are very slow since latest dpkg update
https://bugs.launchpad.net/bugs/537241
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