Public bug reported:

Mir is separate from X so it seems counter intuitive to request xauth
added. But let me explain.

Even despite that Ubuntu Touch on devices like phones and tablets lacks
the X stack almost entirely (except mir and what seems to be modified
version of gtk-x11 libs), yet the X forwarding via ssh is a viable
scenario for the same device, even so. Because the X stack from the
remote client will provide the display and input.

Now, I myself am using X forwarding with Ubuntu Touch phone (Meizu MX4)
and I run Gtk apps using this method. The ONLY step I had to was
creating .Xauthority file. That is the only requirement, everything else
is ready for the scenario. The easiest way to generated .Xauthority fule
is with xauth tool. This is also a very light (sizewise) package, so I
think it would be of great benefit.

Optionally, I would see it of further help if possibly upon setting up account 
in newly installed Ubuntu Touch with only Mir, the .Xauthority could be 
auto-generated in the user's home.
Because Mir and X forwarding via ssh do not conflict, they are not mutually 
exclusive.

1. These changes are of tiny footprint yet improve usability greatly
2. Users who build chroot containers will also benefit, being able to copy 
.Xauthority into the chroot so that when inside they can still instantinate X 
forwarded apps

** Affects: mir (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1648914

Title:
  Add xauth for helping X forwarding scenarios

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