Robert, can you look please? Sounds to me like it's something to do with debconf support which you've worked on lately. The testcase in the original report was on zesty - not sure if it's still there in artful.
** Changed in: gnome-software (Ubuntu) Assignee: (unassigned) => Robert Ancell (robert-ancell) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gconf in Ubuntu. https://bugs.launchpad.net/bugs/1688721 Title: package gconf2-common 3.2.6-3ubuntu7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128 Status in gconf package in Ubuntu: Confirmed Status in gnome-software package in Ubuntu: New Bug description: = Test Case = 1. Download the debian package of Chrome from google 2. Open nautilus and double-click on the file to launch ubuntu software 3. Install the package and proceed with the installation = Expected result = Chrome installs correctly = Actual result = The installation hangs on the following command in gconf2-common.postinst ucf /usr/share/gconf/default.path /etc/gconf/2/path = Original Report = I received this error when trying to install local file google-chrome-stable.deb version 58.0.3029.96-1. This is using gnome-software 3.22.7-0ubuntu3.17.04.2 from zesty-proposed. Other times, the installation process just hangs at some percentage. I am testing this gnome-software version due to Bug (LP: #1672424). The same file was successfully installed with gdebi. ProblemType: Package DistroRelease: Ubuntu 17.04 Package: gconf2-common 3.2.6-3ubuntu7 ProcVersionSignature: Ubuntu 4.10.0-20.22-generic 4.10.8 Uname: Linux 4.10.0-20-generic x86_64 ApportVersion: 2.20.4-0ubuntu4 AptOrdering: gconf2-common:amd64: Install libgconf-2-4:amd64: Install gconf-service-backend:amd64: Install gconf-service:amd64: Install NULL: ConfigurePending Architecture: amd64 Date: Sat May 6 13:56:26 2017 ErrorMessage: subprocess installed post-installation script returned error exit status 128 InstallationDate: Installed on 2017-05-04 (1 days ago) InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412) PackageArchitecture: all RelatedPackageVersions: dpkg 1.18.10ubuntu2 apt 1.4 SourcePackage: gconf Title: package gconf2-common 3.2.6-3ubuntu7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gconf/+bug/1688721/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp