Public bug reported:

There is no separate bug tracker for XMir so I figured that it belongs under 
I installed my own Gtk native Linux arm app (a game) on my ubuntu phone and I 
was happily using it with the following launcher 
[Desktop Entry]
Comment=Simple snake game written in Lazarus by Kris Jacewicz

Obviously the app folder is under ~/.local/xmir/lazSnake
Just today I updated the Ubuntu Touch on my Meizu MX4 phone.
Before update the build description was: Ubuntu 15.04-armhf (20160913-020303)
After update: Ubuntu 15.04-armhf (20161201-020304)

The very same game no longer works. Clicking on its icon in the Apps scope 
starts it but it immediately closes. 
Whatever is the reason, I was already in the past updating my OS couple of 
times and always was able to use the app without any problems at all. Now, 
after updating, I can no longer do this. Whatever the reason is, apparently the 
new Ubuntu image broke some backward compatibility.

Also, I chose libertine as package only because otherwise I would not be able 
to even post this, but my problem is totally unrealted to Libertine.
Some error messages I was seeing are:
[xkb] Can't rename 
/run/user/32011/confined/ubuntu-lazsnake-app.kriscode/filewU9a3p to 
/tmp/server-B20D7FC79C7F597315E3E501AEF10E0D866E8E92.xkm, error: Invalid 
cross-device link
[xkb] Can't rename 
/run/user/32011/confined/ubuntu-lazsnake-app.kriscode/file0Kq8VM to 
/tmp/server-B20D7FC79C7F597315E3E501AEF10E0D866E8E92.xkm, error: Invalid 
cross-device link
XKB: Failed to compile keymap
Keyboard initialization failed. This could be a missing or incorrect setup of 
Fatal server error:
(EE) Failed to activate core devices.(EE) 
XMir has closed unexpectedly

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

** Tags: xmir

** Attachment added: "screen from my phone showing the Gtk game running 
natively on my phone before I updated the OS"

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  XMir support backward compatibility broken after updating OS

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