I've added an entry about this issue to the ReleaseNotes:
https://wiki.ubuntu.com/NattyNarwhal/TechnicalOverview
** Changed in: ubuntu-release-notes
Status: New => Fix Committed
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which is subscribed to xserver-xorg-input-evdev in Ubuntu.
https://bugs.launchpad.net/bugs/710762
Title:
Middle mouse button no longer works
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