When trying to install fglrx / fglrx-updates driver, it fails silently in software-properties-gtk

[Po-Hsu Lin]

When trying to install fglrx / fglrx-updates driver listed in the software-properties-gtk on 14.04.2
the installation failed (see bug 1446037), but it failed silently if you didn't run the software-properties-gtk from a terminal.

It should provide a log for user to check, or tell user where to find the log, otherwise it would be difficult for debugging.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: software-properties-gtk 0.92.37.3
ProcVersionSignature: Ubuntu 3.16.0-34.47~14.04.1-generic 3.16.7-ckt8
Uname: Linux 3.16.0-34-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Apr 19 23:43:45 2015
InstallationDate: Installed on 2015-04-17 (2 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)