** Description changed:

  [Impact]
  Snap development using Mir has been using the "stable phone overlay" PPA 
which is both inconvenient and a legacy of the cancelled Unity8 project.
  
  It would greatly simplify things if Mir were updated in the Xenial
  archive.
  
  [Test Case]
  
  Build a Mir client snap (e.g. lp:~albaguirre/+snap/mir-client-demos)
  against "Primary Ubuntu Archive" and deploy as described in
  https://developer.ubuntu.com/en/snappy/guides/mir-snaps/
  
  Expected: the client apps start and are visible on screen
  Actual: the client apps don't start and are not visible on screen
  
  [Regression Potential]
  Mir has two categories of dependent project:
  
    1 Unity8 and unity-system-compositor "server" packages
    2 toolkits and other "clients" of Mir
  
  "Server" packages from the archive will stop working in the LTS as they
  will continue using the earlier libmirserver.so.38 (from Mir 0.21) which
  doesn't work with the libmirclient.so.9 from Mir 0.26. This is
  unimportant as these packages were provided as an "early experience",
  not for serious use.
  
  "Client" packages are dependent only on libmirclient.so.9 which is ABI
  stable. The principle type of regression would be FTBFS where APIs have
  been deprecated in 0.26. The linked 0.26.3 release has these
  deprecations disabled for 16.04.
  
  The packages are available in silo:
  https://bileto.ubuntu.com/#/ticket/2736
  
  notes:
  
  A recursive search or rdependencies identifies the following packages in
  category 1:
  
  camera-app-autopilot
  gallery-app-autopilot
  indicator-network-autopilot
  indicators-client
  qtdeclarative5-qtmir-plugin
  qtmir-android
  qtmir-desktop
  qtmir-tests
  ubuntu-desktop-mir
  ubuntu-experience-tests
  ubuntu-pocket-desktop
  ubuntu-push-autopilot
  ubuntu-touch
  ubuntu-touch-session
  unity8
  unity8-autopilot
  unity8-desktop-session-mir
  unity-scope-click-autopilot
  unity-system-compositor
  unity-system-compositor-autopilot
  
  Anyone wanting these packages should switch to the "unity8-desktop-
  session" preview package in 17.04 where they are far more functional.
+ 
+ [Alternatives]
+ If we want to keep everything working in Xenial, we *could* bump the 
libmirclient SONAME to libmirclient.so.10. This would result in libmirclient9 
being NBS, but continuing to work against the Mir servers available in 16.04 
(until and unless they are rebuilt).

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https://bugs.launchpad.net/bugs/1685186

Title:
  [SRU] Mir needs to be updated to 0.26 in 16.04LTS

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