/usr/bin/update-manager:AttributeError:/usr/bin/update-manager@122:start_update:start_available:refresh_cache:update

The Ubuntu Error Tracker has been receiving reports about a problem regarding update-manager. This problem was most recently seen with package version 1:17.04.3, the problem page at https://errors.ubuntu.com/problem/a803c3b2b08fe5d0f422ef14193d607ac3217762 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/.