I don’t have a machine running zesty atm but according to comment #13 from Santosh, disabling apparmor confinement for webbrowser-app allows the app to launch. Which would confirm that the problem is caused by an apparmor denial that prevents Qt (and oxide) to find a suitable EGL config.
>From Kevin’s logs in comment #5, the following denial stands out as possibly related: Jan 26 11:46:48 kg-Studio-1737 kernel: [11478.602886] audit: type=1400 audit(1485452808.772:62): apparmor="DENIED" operation="open" profile ="webbrowser-app" name="/dev/dri/" pid=3487 comm="webbrowser-app" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to webbrowser-app in Ubuntu. https://bugs.launchpad.net/bugs/1590561 Title: webbrowser-app crashes on startup on fresh zesty Unity8: No suitable EGL configs found Status in Canonical System Image: Confirmed Status in Oxide: Confirmed Status in webbrowser-app package in Ubuntu: Invalid Bug description: When trying to start webbrowser-app a unresponsive window appears and after a few moments it crashes. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: webbrowser-app 0.23+16.04.20160413-0ubuntu1 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity Date: Wed Jun 8 22:56:35 2016 InstallationDate: Installed on 2016-04-28 (41 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) SourcePackage: webbrowser-app UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1590561/+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