Comment 0 for bug 1310781

There's an occasional (one in 512 or so) key exchange failure in the curve25519-sha256 key exchange method, which affects OpenSSH 6.5 and 6.6. Upstream gives more details here and has recommended that distributors apply this patch:

  https://lists.mindrot.org/pipermail/openssh-unix-dev/2014-April/032494.html

We should issue this as an update for trusty.