Question on install vlc 3.0 by snap on ubuntu 16.04

[vlc_linux]

Hello, I am using snap to install vlc 3.0 on ubuntu 16.04 by those commands: sudo apt update;sudo apt install snapd;sudo snap install vlc. It can install successfully.but when I run vlc,it does not work（gui can not display）and show "Qt:Session management error:none of the authentication protocols are support killed" and I am not use root to log in. How to solve this problem? Thanks!

[thresh]

Show the output of "snap run vlc -vv" please.