I would like to install btrfs-restore on Kubuntu 12.04
apt-cache search btrfs-restore returns nothing.
"ubuntu download OR install btrfs-restore" returns nothing useful.
Also, where do I get btrfs help? I'm not getting any replies on #btrfs on freenode.net. (Correction: I was too impatient. #btrfs was very helpful!)
UPDATE: the previously accepted answer no longer works, so I unselected it as the answer. The PPA dmitrij.ledkov/ppa is missing now. Thanks to Pkunk at #btrfs, I posted a new solution below.