/bin/bash:11:wait_for:execute_command_internal:execute_command:reader_loop:main

The Ubuntu Error Tracker has been receiving reports about a problem regarding bash. This problem was most recently seen with package version 4.3-15ubuntu1, the problem page at https://errors.ubuntu.com/problem/1b8713f1ccb913cb26c39acfd8bb7b816f932fd4 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/.