/usr/share/apport/apport-gtk:11:_gtk_settings_get_screen:gtk_css_value_icon_theme_compute:gtk_css_static_style_compute_value:_gtk_css_lookup_resolve:gtk_css_static_style_new_compute

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding apport. This problem was most recently seen with package version 2.20.11-0ubuntu7, the problem page at https://errors.ubuntu.com/problem/815a179408135a894bbb5921adef3757563c75c5 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.