I found that the issue may be with chromium itself, not apport: a different application that is expected to open a given URL (ipython notebook) fails to do that as well.
Using chromium-browser 49.0.2623.108-0ubuntu1.1233 (Note that chromium correctly open a requested URL if launched as "chromium-browser <url>" from the command line). ** Also affects: chromium-browser Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apport in Ubuntu. https://bugs.launchpad.net/bugs/1570806 Title: ubuntu-bug fails to open launchpad page when default browser is chromium Status in Chromium Browser: New Status in apport package in Ubuntu: New Bug description: Release: Ubuntu 16.04 LTS (pre-release daily build) Hardware: Dell Inspiron 15 5000 Series (Intel(R)) - 5559 Using ubuntu-bug correctly opens the GTK gui, but after hitting "Send" a new chromium instance is opened with apparently no page loaded. No errors are displayed, only this warning (although before hitting send): ``` /usr/share/apport/apport-gtk:16: PyGIWarning: Wnck was imported without specifying a version first. Use gi.require_version('Wnck', '3.0') before import to ensure that the right version gets loaded. from gi.repository import GLib, Wnck, GdkX11, Gdk ``` Workaround: making Firefox the default browser from within Firefox itself. Note that ubuntu-bug --save PATH works fine. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: apport 2.20.1-0ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6 Uname: Linux 4.4.0-18-generic x86_64 ApportLog: ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CrashReports: 640:1000:116:18680539:2016-04-14 23:05:48.336127519 +0100:2016-04-14 23:05:49.336127519 +0100:/var/crash/_usr_bin_compiz.1000.crash CurrentDesktop: Unity Date: Fri Apr 15 12:14:40 2016 InstallationDate: Installed on 2016-04-14 (0 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160414) PackageArchitecture: all SourcePackage: apport UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/chromium-browser/+bug/1570806/+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