I'm happy to announce, that ardour 2.1 is now in the gutsy-backports repository. To access it, add the following line to your /etc/apt/sources.list file, and update.
deb http://archive.ubuntu.com/ubuntu/ gutsy-backports universe
If you don't want any other backports, I would suggest installing ardour from backports, and then disabling/removing the above line.
Thanks to the backports team for taking care of this.
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