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[Brian Murray]

The Ubuntu Error Tracker has been receiving reports about a problem regarding ubuntu-release-upgrader. This problem was most recently seen with package version 1:16.10.6, the problem page at https://errors.ubuntu.com/problem/8448ee18bc3bc99b7bcd6821b53790c61942d7b4 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/.