/usr/lib/update-notifier/system-crash-notification:7:FT_Stream_ReadULong:sfnt_open_font:sfnt_init_face:tt_face_init:open_face

[Brian Murray]

The Ubuntu Error Tracker has been receiving reports about a problem regarding update-notifier. This problem was most recently seen with package version 3.174, the problem page at https://errors.ubuntu.com/problem/acae3acfdc330f853bb166c1d52c93d25436e3dc 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/.