/bin/bash:11:yyparse:parse_command:parse_and_execute:evalstring:execute_builtin

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding bash. This problem was most recently seen with package version 4.4.18-2ubuntu1, the problem page at https://errors.ubuntu.com/problem/c41e9045833aba7b3134d7fb0f0c579757728ac4 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/.