Comment 1 for bug 1703827

I wasn't able to recreate this issue e.g. the original code works fine for me.

That being said it certainly appears to be an issue affecting a lot of people:

https://errors.ubuntu.com/problem/76dc05ff3a34f1b74353bf3103378e872e58dea2

There about 260 reports from 16.04 users regarding it.