I find CDH does not support Ubuntu 18.04 yet, and plan to support ? I hope Ubuntu 18.04 can be supported, and Canonical extends Ubuntu 18.04 support to 10 years, really LTS. So I hope CDH could support Ubuntu 18.04.
Ubuntu 18.04 is now supported with CDH 6.2 release, see Release Notes
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As per, lastest cdh 6.1 support 16.04 LTS (Xenial). For reference, Cloudera Enterprise 6.1.x Supported Operating Systems
Hope that helps.
About the future roadmap, I obviously don't have the visibility. It will be better known to product teams.
Will CDH 5 also going to support Ubuntu 18.04?
There are no plans to add support to C5 releases. See currently supported OS versions