Yakkety and Xenial have already been released. Packages do not get updated after release. Specific critcal bugs can be fixed through the Stable Release Updates (SRU) process.
However, in the case of libav, this package was removed from Ubuntu after the vivid release, in favour of ffmpeg. Perhaps you can use that library instead? ** Changed in: libav (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libav in Ubuntu. https://bugs.launchpad.net/bugs/1570749 Title: Upgrade to 11.7 from May 2016 Status in libav package in Ubuntu: Invalid Bug description: Please, upgrade to 11.6 from February 2016, see https://libav.org/ and https://git.libav.org/?p=libav.git;a=blob;f=Changelog;hb=refs/tags/v11.6 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libav/+bug/1570749/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp