xdg-open doesn't work only in xubuntu

[Vasilisc]

This test case does not work in Xubuntu.
---------------------
name: test2
version: "1"
summary: TEst
description: |
     TEST
confinement: strict
architectures: [amd64]

apps:
   test2:
     command: xdg-open "http://google.com"
     plugs: [network, network-bind, x11, home, unity7, gsettings]

parts:
   integration:
    plugin: nil
    stage-packages:
     - bash
     - xdg-utils
    after: [desktop-gtk2]
---------------------
Output
$ test2
/snap/test2/x1/usr/bin/xdg-open: 630: /snap/test2/x1/usr/bin/xdg-open: 
exo-open: not found


System info:

$ LANG=C sudo apt policy xfce4
xfce4:
   Installed: (none)
   Candidate: 4.12.2
   Version table:
      4.12.2 500
         500 http://ru.archive.ubuntu.com/ubuntu xenial/universe amd64 
Packages
         500 http://ru.archive.ubuntu.com/ubuntu xenial/universe i386 
Packages

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.2 LTS
Release:	16.04
Codename:	xenial

$ LANG=C sudo apt policy exo-utils
exo-utils:
   Installed: 0.10.7-1
   Candidate: 0.10.7-1
   Version table:
  *** 0.10.7-1 500
         500 http://ru.archive.ubuntu.com/ubuntu xenial/universe amd64 
Packages
         100 /var/lib/dpkg/status

$ whereis exo-open
exo-open: /usr/bin/exo-open /usr/share/man/man1/exo-open.1.gz


I found this bug
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1535471
but there is no solution

-- 
Best regards,
vasilisc