OK, not strictly necessary to upgrade. This workaround fixes the behavior: https://github.com/fideloper/docker-nginx-php/issues/15#issuecomment-303701864
``` LC_ALL=C.UTF-8 add-apt-repository ppa:username/repo ```
OK, not strictly necessary to upgrade. This workaround fixes the behavior: https:/ /github. com/fideloper/ docker- nginx-php/ issues/ 15#issuecomment -303701864
```
LC_ALL=C.UTF-8 add-apt-repository ppa:username/repo
```