It’s not just Ubuntu.Thumbnailer, it’s also the import of Ubuntu.Content in DownloadsPage.qml. That one needs to be made conditional too.
When I start webbrowser-app on a fresh xenial desktop install, I’m getting the following error messages: file:///usr/share/webbrowser-app/webbrowser/webbrowser-app.qml:41 Type Browser unavailable file:///usr/share/webbrowser-app/webbrowser/Browser.qml:930 Type DownloadsPage unavailable file:///usr/share/webbrowser-app/webbrowser/DownloadsPage.qml:23 module "Ubuntu.Thumbnailer" is not installed file:///usr/share/webbrowser-app/webbrowser/DownloadsPage.qml:24 module "Ubuntu.Content" is not installed The branch linked to that bug fixes only half of the problem. -- 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/1531179 Title: [desktop] Crashes on startup in xenial: module "Ubuntu.Thumbnailer" is not installed Status in Canonical System Image: In Progress Status in webbrowser-app package in Ubuntu: In Progress Bug description: $ webbrowser-app (webbrowser-app:19925): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permission denied. dconf will not work properly. (webbrowser-app:19925): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permission denied. dconf will not work properly. (webbrowser-app:19925): dconf-CRITICAL **: unable to create file '/run/user/1001/dconf/user': Permission denied. dconf will not work properly. "file:///usr/share/webbrowser-app/webbrowser/webbrowser-app.qml:41 Type Browser unavailable\nfile:///usr/share/webbrowser-app/webbrowser/Browser.qml:936 Type DownloadsPage unavailable\nfile:///usr/share/webbrowser-app/webbrowser/DownloadsPage.qml:23 module \"Ubuntu.Thumbnailer\" is not installed\n" To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1531179/+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