command line - Snap Launching on Unity 7 But Not Unity 8 - Ask Ubuntu

i have snap working , running on unity 7 (16.04 , 16.10).

however when try run on unity 8 (16.10) hit this:

...     gmt qxcbconnection: not connect display aborted (core dumped) 

(see full log)

has come across this? if so, mean , how resolve , snap working on unity 8?

from searching i've done mention headless server isn't case because i'm trying launch snap not server.

any appreciated, in advance!