Use more recent version of Ubuntu in Docker
The following discussion from !112 (merged) should be addressed:
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@lriedel started a discussion: (+6 comments) What do you think about switching to the most recent version of Ubuntu, where we could use a much more recent compiler? Clusters tend to have very outdated software, but we actually got Utopia running on a cluster so I'm quite confident that this could work even if we do not test against old Clang and GCC versions.
Edited by Santiago Ospina De Los Ríos