Latest update not compatible with Ubuntu 14.04

[Vingtoft]

This bug is discussed here. I had the same problem described in the linked thread, and I can confirm that the only solution (that i know about) is to update to Ubuntu 16.04.

[hardware]

This issue only concern wonderfall/nginx docker image, not hardware/mailserver image. Update AUFS or patch it manually or change your reverse proxy with another docker image like https://github.com/jwilder/nginx-proxy