I get an "Unable to install "IDEA Community": forbidden" error even though clicking the install button initiated the download and installation sucessfully

[Seija K.]

When I attempted to install "IDEA Community," gnome-software gave me an error saying "Unable to install 'IDEA Community': forbidden," and then less than a second later, I was prompted for my password, and upon entering it in, the installation started without issue.

The problem is that the error occurred even though the download and installation happened successfully WITHOUT my having to click on the "install" button again, so this is a false error.

Steps to Reproduce:
1. Launch GNOME Software Center
2. Click on IDEA Community
3. Click on the Install button
4. Notice that a "forbidden" error is raised and then you are prompted for a password. Enter the password and find that the installation proceeds without issue.

Expected Results:
Installation begins without any "Unable to install" messages

Actual Results:
"forbidden" error appears even though an authentication window appeared, and entering the password correctly initiated the download and installation.

Ubuntu Release: 18.04 LTS

Package: gnome-software 3.28.1-0ubuntu4

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-software 3.28.1-0ubuntu4
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Fri Jun 8 19:43:03 2018
InstallationDate: Installed on 2018-06-08 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
InstalledPlugins:
 gnome-software-plugin-flatpak N/A
 gnome-software-plugin-limba N/A
 gnome-software-plugin-snap 3.28.1-0ubuntu4
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-software
UpgradeStatus: No upgrade log present (probably fresh install)