Comment 2 for bug 1581971

This is caused by two things.

1) One of the default plugins in MCC has an incorrect field name from fixes we did to get it working on 16.04. (mythweb_password_combobox in this instance)

2) mythbuntu-bare throws similiar errors.

As a solution, mythbuntu-bare should be removed, since it's never worked great to begin with and isn't being maintained anymore (alternatively, we can try to fix it).