"grade" property not specified: defaulting to "stable"
Device /root/build_mars removed from snapcraft-mars
Mounting /home/dllewellyn/Documents/snapcraft/mars-shooter into container
Device /root/build_mars added to snapcraft-mars
Waiting for a network connection...
Network connection established
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:2 http://archive.ubuntu.com/ubuntu xenial InRelease
Get:3 http://archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Get:4 http://archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Fetched 306 kB in 0s (390 kB/s)
Reading package lists...
Reading package lists...
Building dependency tree...
Reading state information...
squashfuse is already the newest version (0.1.100-0ubuntu1~ubuntu16.04.1).
The following packages were automatically installed and are no longer required:
  cmake cmake-data libasound2 libasound2-data libasyncns0 libcurl3
  libdrm-amdgpu1 libdrm-dev libdrm-intel1 libdrm-nouveau2 libdrm-radeon1
  libflac-dev libflac8 libfreetype6 libfreetype6-dev libfribidi-dev
  libgl1-mesa-dev libgl1-mesa-dri libgl1-mesa-glx libglapi-mesa libglew-dev
  libglew1.13 libglu1-mesa libglu1-mesa-dev libjpeg-dev libjpeg-turbo8
  libjpeg-turbo8-dev libjpeg8 libjpeg8-dev libjsoncpp1 libllvm4.0 libogg-dev
  libogg0 libopenal-data libopenal-dev libopenal1 libpciaccess0 libpng12-dev
  libpthread-stubs0-dev libpulse0 libsensors4 libsndfile1 libsndfile1-dev
  libtag1-dev libtag1v5 libtag1v5-vanilla libtxc-dxtn-s2tc0 libudev-dev
  libvorbis-dev libvorbis0a libvorbisenc2 libvorbisfile3 libx11-dev libx11-doc
  libx11-xcb-dev libx11-xcb1 libxau-dev libxcb-dri2-0 libxcb-dri2-0-dev
  libxcb-dri3-0 libxcb-dri3-dev libxcb-glx0 libxcb-glx0-dev libxcb-image0
  libxcb-image0-dev libxcb-present-dev libxcb-present0 libxcb-randr0
  libxcb-randr0-dev libxcb-render0 libxcb-render0-dev libxcb-shape0
  libxcb-shape0-dev libxcb-shm0 libxcb-shm0-dev libxcb-sync-dev libxcb-sync1
  libxcb-util1 libxcb-xfixes0 libxcb-xfixes0-dev libxcb1-dev libxdamage-dev
  libxdamage1 libxdmcp-dev libxext-dev libxfixes-dev libxfixes3 libxrandr-dev
  libxrandr2 libxrender-dev libxrender1 libxshmfence-dev libxshmfence1
  libxxf86vm-dev libxxf86vm1 mesa-common-dev pkg-config x11proto-core-dev
  x11proto-damage-dev x11proto-dri2-dev x11proto-fixes-dev x11proto-gl-dev
  x11proto-input-dev x11proto-kb-dev x11proto-randr-dev x11proto-render-dev
  x11proto-xext-dev x11proto-xf86vidmode-dev xorg-sgml-doctools xtrans-dev
  zlib1g-dev
Use 'apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.
Looking up assertion ['account-key', 'public-key-sha3-384=BWDEoaqyr25nF5SNCvEv2v7QnM9QsfCc0PBMYD_i2NGSQ32EF2d4D0hqUel3m8ul']
Looking up assertion ['snap-declaration', 'snap-name=core']
Looking up assertion ['snap-revision', 'snap-revision=2774', 'snap-id=99T7MUlRhtI3U0QFgl5mXXESAiSwt776']
Adding assertion core_2774.assert
Installing /run/core_2774.snap

[|] Stop snap "core" services
[/] Copy snap "core" dataerror: cannot perform the following tasks:
- Copy snap "core" data (cannot copy "/var/snap/core/2774" to "/var/snap/core/2774": failed to copy all: "cp: cannot stat '/var/snap/core/2774': No such file or directory" (1))

Stopping local:snapcraft-mars
Traceback (most recent call last):
  File "/snap/snapcraft/473/bin/snapcraft", line 11, in <module>
    load_entry_point('snapcraft==2.33', 'console_scripts', 'snapcraft')()
  File "/snap/snapcraft/473/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 565, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/snap/snapcraft/473/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2631, in load_entry_point
    return ep.load()
  File "/snap/snapcraft/473/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2291, in load
    return self.resolve()
  File "/snap/snapcraft/473/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2297, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/cli/__main__.py", line 19, in <module>
    run(prog_name='snapcraft')
  File "/snap/snapcraft/473/lib/python3.6/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/click/core.py", line 1043, in invoke
    return Command.invoke(self, ctx)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/cli/__init__.py", line 110, in run
    ctx.forward(lifecyclecli.commands['snap'])
  File "/snap/snapcraft/473/lib/python3.6/site-packages/click/core.py", line 553, in forward
    return self.invoke(cmd, **kwargs)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/cli/lifecycle.py", line 129, in snap
    lifecycle.containerbuild('snap', project_options, output, directory)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/internal/lifecycle.py", line 314, in containerbuild
    metadata=config.get_metadata()).execute(step, args)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/internal/lxd.py", line 342, in execute
    super().execute(step, args)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/internal/lxd.py", line 143, in execute
    self._inject_snapcraft()
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/internal/lxd.py", line 187, in _inject_snapcraft
    self._inject_snap('core')
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/internal/lxd.py", line 243, in _inject_snap
    self._container_run(cmd)
  File "/snap/snapcraft/473/lib/python3.6/site-packages/snapcraft/internal/lxd.py", line 107, in _container_run
    check_call(['lxc', 'exec', self._container_name, '--'] + cmd)
  File "/snap/snapcraft/473/usr/lib/python3.6/subprocess.py", line 291, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['lxc', 'exec', 'local:snapcraft-mars', '--', 'snap', 'install', '/run/core_2774.snap']' returned non-zero exit status 1.