I'd suggest reporting this to the upstream developers.
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Emacs will not paste into other programs
https://bugs.launchpad.net/bugs/321721
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Public bug reported:
On ubuntu Intrepid using emacs gtk from add/remove
If you use alt-w to copy in emacs you will not be able to paste into
other gnome applications. Specifically I was trying to paste into
Thunderbirds. Using the copy from the menu works but it is slow.
** Affects: emacs22