/usr/bin/nautilus:11:gtk_widget_unparent:_gtk_window_remove_popover:_gtk_popover_parent_hierarchy_changed:g_cclosure_marshal_VOID__OBJECTv:_g_closure_invoke_va

The Ubuntu Error Tracker has been receiving reports about a problem regarding nautilus. This problem was most recently seen with package version 1:3.26.4-0ubuntu9, the problem page at https://errors.ubuntu.com/problem/f3dfe70df677528d3c08d995e36f7de341d2167d 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/.