Comment 4 for bug 1574851

apt-cache policy snapd
snapd:
  Installed: 2.0.9
  Candidate: 2.0.9
  Version table:
 *** 2.0.9 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages

apt-cache policy snap-confine
N: Unable to locate package snap-confine

dpkg --get-selections | grep nvidia
nvidia-361 install
nvidia-opencl-icd-361 install
nvidia-prime install
nvidia-settings install

snap: ubuntu-clock-app version: 3.6+snap3, rev: 5

Running it results in:

$ubuntu-clock-app.clock
libGL error: No matchings fbConfigs or visuals found
libGL error: failed to load driver: swrast
Unrecognized OpenGL version
Unrecognized OpenGL version