Snap refresh or new install stuck at 'Run configure hook of "core" snap if present'

[Martin Winter]

So not sure what’s going on.

Since the latest update of my Ubuntu 16.04.2 (Server, x86_64) I can’t 
do a “snap refresh” anymore or
reinstalling it.

Basically it seems to try installing or updating (If I have earlier 
version) and gets
stuck forever (or at least > 2hrs) at
[/] Run configure hook of "core" snap if present

(And spinning the animation in [ ])

Curious if anyone has seen the same. All my Ubuntu 16.04 Servers have 
this issue.
(Approx 10 Servers which are part of my CI system)

Thoughts?

- Martin Winter