gnome-calculator snap fails to launch on 18.04.1

[Jean-Baptiste Lallement]

bionic 20180722

gnome-calculator fails to launch on the live session and after installation with "Cannot open display :0"

From the journal
ul 23 09:13:28 ubuntu audit[4839]: AVC apparmor="DENIED" operation="open" profile="snap.gnome-calculator.gnome-calculator" name="/home/ubuntu/.config/user-dirs.dirs" pid=4839 comm="head" requested_mask="r" denied_mask="r" fsuid=999 ouid=999
Jul 23 09:13:28 ubuntu kernel: audit: type=1400 audit(1532337208.887:24): apparmor="DENIED" operation="open" profile="snap.gnome-calculator.gnome-calculator" name="/home/ubuntu/.config/user-dirs.dirs" pid=4839 comm="head" requested_mask="r" denied_mask="r" fsuid=999 ouid=999
Jul 23 09:13:28 ubuntu audit[4854]: AVC apparmor="DENIED" operation="open" profile="snap.gnome-calculator.gnome-calculator" name="/etc/xdg/user-dirs.conf" pid=4854 comm="xdg-user-dirs-u" requested_mask="r" denied_mask="r" fsuid=999 ouid=0
Jul 23 09:13:28 ubuntu kernel: audit: type=1400 audit(1532337208.911:25): apparmor="DENIED" operation="open" profile="snap.gnome-calculator.gnome-calculator" name="/etc/xdg/user-dirs.conf" pid=4854 comm="xdg-user-dirs-u" requested_mask="r" denied_mask="r" fsuid=999 ouid=0
Jul 23 09:13:28 ubuntu gnome-calculator_gnome-calculator.desktop[4794]: ln: failed to create symbolic link '/home/ubuntu/snap/gnome-calculator/180/snap/gnome-calculator/180/Documents': No such file or directory
Jul 23 09:13:28 ubuntu gnome-calculator_gnome-calculator.desktop[4794]: ln: failed to create symbolic link '/home/ubuntu/snap/gnome-calculator/180/snap/gnome-calculator/180/Desktop': No such file or directory
Jul 23 09:13:28 ubuntu gnome-calculator_gnome-calculator.desktop[4794]: ln: failed to create symbolic link '/home/ubuntu/snap/gnome-calculator/180/snap/gnome-calculator/180/Downloads': No such file or directory
Jul 23 09:13:28 ubuntu gnome-calculator_gnome-calculator.desktop[4794]: ln: failed to create symbolic link '/home/ubuntu/snap/gnome-calculator/180/snap/gnome-calculator/180/Music': No such file or directory
Jul 23 09:13:28 ubuntu gnome-calculator_gnome-calculator.desktop[4794]: ln: failed to create symbolic link '/home/ubuntu/snap/gnome-calculator/180/snap/gnome-calculator/180/Pictures': No such file or directory
Jul 23 09:13:28 ubuntu gnome-calculator_gnome-calculator.desktop[4794]: ln: failed to create symbolic link '/home/ubuntu/snap/gnome-calculator/180/snap/gnome-calculator/180/Videos': No such file or directory
Jul 23 09:13:28 ubuntu gnome-calculator_gnome-calculator.desktop[4794]: ln: failed to create symbolic link '/home/ubuntu/snap/gnome-calculator/180/snap/gnome-calculator/180/Templates': No such file or directory
Jul 23 09:13:29 ubuntu audit[4794]: AVC apparmor="DENIED" operation="connect" profile="snap.gnome-calculator.gnome-calculator" pid=4794 comm="gnome-calculato" family="unix" sock_type="stream" protocol=0 requested_mask="send receive connect" denied_mask="send connect" addr=none peer_addr="@/tmp/.X11-unix/X0" peer="unconfined"
Jul 23 09:13:29 ubuntu gnome-calculator_gnome-calculator.desktop[4794]: Unable to init server: Could not connect: Connection refused
Jul 23 09:13:29 ubuntu kernel: audit: type=1400 audit(1532337209.007:26): apparmor="DENIED" operation="connect" profile="snap.gnome-calculator.gnome-calculator" pid=4794 comm="gnome-calculato" family="unix" sock_type="stream" protocol=0 requested_mask="send receive connect" denied_mask="send connect" addr=none peer_addr="@/tmp/.X11-unix/X0" peer="unconfined"
Jul 23 09:13:29 ubuntu desktop-launch[4794]: cannot open display: :0

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gnome-calculator 1:3.28.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
ApportVersion: 2.20.10-0ubuntu5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Jul 23 11:16:55 2018
InstallationDate: Installed on 2014-07-15 (1469 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140520)
SourcePackage: gnome-calculator
UpgradeStatus: Upgraded to cosmic on 2018-03-24 (120 days ago)

Also tracked in https://forum.snapcraft.io/t/gnome-calculator-failed-to-create-symbolic-link/5742