+ snap install hello-world
hello-world 16.04-1 from 'mvo' installed
+ '[' '!' -d /run/user/0 ']'
+ mkdir -p /run/user/0
+ chmod 700 /run/user/0
+ echo 'foo bar'
+ ensure_xauth_path /tmp/invalid-xauthority /tmp/invalid-xauthority
+ export XAUTHORITY=/tmp/invalid-xauthority
+ XAUTHORITY=/tmp/invalid-xauthority
+ rm -f /var/snap/hello-world/common/xauth-content /run/user/0/.Xauthority
+ snap run --shell hello-world
error: cannot find app "hello-world" in "hello-world"