'Unable to install "GNOME Characters": cannot perform the following tasks' but it installs anyway

[Ads20000]

Hit install for GNOME Characters (stable) and got the popup in the title above but it runs fine...

```
$ snap info gnome-characters
tracking: stable
refreshed: 2018-04-27T02:36:32+01:00
installed: 3.28.0 (86) 13MB -
$ snap version
snap 2.32.8+18.04
snapd 2.32.8+18.04
series 16
ubuntu 18.04
kernel 4.15.0-20-generic
$ snap info core
tracking: beta
refreshed: 2018-05-11T15:51:12+01:00
installed: 16-2.32.8 (4650) 90MB core
```

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-software 3.28.1-0ubuntu4
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: communitheme:ubuntu:GNOME
Date: Thu May 17 14:25:14 2018
InstallationDate: Installed on 2017-08-03 (286 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
InstalledPlugins:
 gnome-software-plugin-flatpak 3.28.1-0ubuntu4
 gnome-software-plugin-limba N/A
 gnome-software-plugin-snap 3.28.1-0ubuntu4
SourcePackage: gnome-software
UpgradeStatus: Upgraded to bionic on 2018-04-22 (25 days ago)