/usr/lib/x86_64-linux-gnu/webkit2gtk-4.0/WebKitWebProcess:11:WebCore::GLContextGLX::createPbufferContext:WebCore::GLContextGLX::createSharingContext:WebCore::GLContext::createSharingContext:WebCore::PlatformDisplay::sharingGLContext:WebCore::GLContextGLX::createContext

The Ubuntu Error Tracker has been receiving reports about a problem regarding webkit2gtk. This problem was most recently seen with package version 2.14.2-1, the problem page at https://errors.ubuntu.com/problem/372c1447b6df3061ac0c758fc32f37c98c58a49a 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 you can request it at http://forms.canonical.com/reports/.