I hit a problem about encryption on 18.04, and this question was perfect. However, it was closed as off-topic saying that it should be reported as a bug.
However, this isn't a bug — it's a deliberate decision by Canonical. The poster is asking how to apply the alternative route that Canonical itself recommends, which I think is a valid question.
So, should this question really have been closed as off-topic? Please help me to understand.