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This pull request fixes the Dockerfile, which contains tests for several Linux distributions. It also replaces Ubuntu 14.10 by Ubuntu 16.04.
Our Docker build has been failing for some time now. Unfortunately, this build is not very useful (even though it runs limited tests on more Linux distributions than any other CI) since we do not receive automatic notifications when it fails. It may not be too long to build an IRC notification system from the webhook feature they offer...