1. install everything

sudo snap install mir-libs --beta
sudo snap install mir-kiosk --beta
sudo snap install ubuntu-app-platform --edge
sudo snap install pulseaudio
sudo snap install webdemo --edge

Make sure the interfaces are connected


2. update the apparmor profile for mir-kiosk for the changes in https://github.com/snapcore/snapd/pull/3006/files#diff-1a64a62cd0175e1d6e1e7eb9b5f1f9afL39

Adjust /var/lib/snapd/apparmor/profiles/snap.mir-kiosk.mir-kiosk to include:

capability sys_admin,
/run/udev/data/+platform:* r,

Reload the profile with:
sudo apparmor_parser -r /var/lib/snapd/apparmor/profiles/snap.mir-kiosk.mir-kiosk

Restart mir kiosk:
sudo service snap.mir-kiosk.mir-kiosk stop ; sudo /usr/lib/snapd/snap-discard-ns mir-kiosk ; sudo service snap.mir-kiosk.mir-kiosk start


3. update the apparmor profile for webdemo for the changes to browser-support and opengl in https://github.com/snapcore/snapd/pull/3006/files

Adjust /var/lib/snapd/apparmor/profiles/snap.webdemo.webdemo to include:

deny /{dev,run,var/run}/shm/lttng-ust-* rw,
/dev/dri/ r,
/sys/devices/pci[0-9]*/**/config r,

Reload the profile with:
sudo apparmor_parser -r /var/lib/snapd/apparmor/profiles/snap.webdemo.webdemo

Restart mir kiosk:
sudo service snap.webdemo.webdemo stop ; sudo /usr/lib/snapd/snap-discard-ns webdemo ; sudo service snap.webdemo.webdemo start


4. You'll need to create a wrapper to remove files from SNAP_USER_DATA to avoid a segfault on subsequent runs, ala http://paste.ubuntu.com/24139053/


5. That wrapper should include this to workaround a snappy bug:

export XDG_RUNTIME_DIR=/tmp