Ubuntu 16.04, code named Xenial Xerus, is now open for development. Xenial's kernel repositories can be found at:

git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/xenial

git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux-meta/+git/xenial

git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux-signed/+git/xenial

We are initially tracking the 4.2.x stable series on the xenial master branch.  The master-next branch has however been rebased to v4.3-rc7.

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Important upcoming dates: TBD